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Business Mathematics ADL 22 V1

ASSIGNMENT – A

1. (A) Simplify:

[(a+x)1/2 + (a-x)1/2] / [(a+x)1/2 – (a-x)1/2] = a / x 11/2

(B) Prove by way of Mathematical Induction :

13+23+33+43+ – – – – – – – – – – – – – – – – – + n3 = [n2(n+1)2] / 4 11/2

2. Prove the following Trigonometric Identity: 3

2(Sin6A + Cos6A) – 3(Sin4A + Cos4A) + 1 = 0

3. Draw the Graph of the following In-Equations and find the Common Feasible Solution along with the Vertices :

x+y <= 4 ; 3x+y >= 3 ; x+4y >= 4 ; x <= 3 ; y >= 2 3

4. (A) Show whether the following is a ‘Tautology’ or a ‘Contradiction’ ?

((p ? q) ? (q ? r)) ? (p ? r) 11/2

(B) For what values of ‘k’ the terms :

1 + k , 5/6 + k , 13/18 + k are in Geometric Progression ? 11/2

5. Find dy/dx if : 3

(tan-1x)y + (y)cotx = 1

ASSIGNMENT – B

1. (A) If a , b , c are in Arithmetic Progression prove : 21/2

1 / (b1/2+c1/2) , 1 / (c1/2+a1/2) , 1 / (a1/2+b1/2) are also in A.P.

(B) Integrate the following function : 21/2

(x) / [(x+1)(x-1)3]

2. The angle of elevation of a jet plane from a point A on the ground is 60* . After a f flight of 15 seconds, the angle of elevation changes to 30* . If the jet plane is f l flying at a constant height of 1500?3m, find the Speed of the jet plane. 5

4. (A) Solve the following System of Equations in Matrix Form : 21/2

2/x + 3/y + 10/z = 4

4/x – 6/y + 5/z = 1

6/x + 9/y – 20/z = 2

(B) A survey has been taken on methods of computer travel. Each respondent was

Asked to check BUS, TRAIN, or AUTOMOBILE as a major method of traveling to work. More than one answer was permitted. The results reported was as follows : BUS – 30 people; TRAIN – 35 people; AUTOMOBILE – 100 people; BUS and TRAIN – 15 people; BUS and AUTOMOBILE – 15 people; TRAIN and AUTOMOBILE – 20 people; and all three methods – 5 people. How many people completed the survey form. 21/2

ASSIGNMENT – C

OBJECTIVE TYPE QUESTIONS

1. If in a G.P. a = 4 , r = 5 then S6 = ?

a. 15265 b. 15625

c. 15562 d. 15225

2. The Disjunction of ‘p’ and ‘q’ is true if :

a. Both p and q are true

b. When p is true and q is false

c. When p is false and q is true

d. When p or q is true

3. Value of the Determinant Cosx Sinx is :

-Sinx Cosx

a. Cos2x – Sin2x b. 0

b. 1 d. Cosx + Sinx

4. Derivative of x + (1/x) w.r.t x is equal to :

a. 1 – x b. 1 – 1/x2

b. 1 + (1/x) d. 1 + 1/x2

5. Sum of money will double itself at 10% per year Simple Interest in :

a. 5 yrs b. 2 yrs

c. 20 yrs d. 10 yrs

6. In an In-Equation x <= 2; solution for x is = ?

a. All real values less than 2.

b. Value equal to 2.

c. All real values less than and equal to 2.

d. All real values other than 2.

7. If a + b + c = 0, value of x(a.a) / bc . x(b.b) / ac. x(c.c) / ab is = ?

a. x b. x3

b. x0 d. xabc

8. If A={1,2,3,4} , B={2,4,6,8} , C={3,4,5,6} then A’?B is equal to :

a. A?B’ b. A’?B’

c. (A?B)’ d. (A?B’)’

9. If the two Linear Equations :

(k – 3)x + 3y – k = 0 and kx + ky = 12 has Infinite Many Solutions, then value of k will be = ?

a. k = 0 b. k = 6

c. k = -6 c. None of the Above

10. If the value of (7+3?5) / (3+?5) is equal to (3+?5) / 2 then the value of

(7-3?5) / (3-?5) is equal to :

a. (3+?5) / 2 b. 3?5

c. (3-?5) / 2 d. 7?5

11. What will be the value of A ? B if

A = 1 1 0 B = 1 0 0 0

0 1 0 0 1 1 0

1 1 0 1 0 1 1

0 0 1

a. 1 1 1 0 b. 1 1 1 0

0 1 1 0 0 1 1 0

1 1 1 0 1 0 1 1

1 0 1 1 1 0 1 1

1 0 1 1 1 0 1 1

c. 1 1 1 0 d. 0 1 0 1

0 0 1 0 1 1 1 0

1 0 1 1 1 0 1 1

12. A tower is 100?3m high. What will be the angle of elevation if its top from a point is 100m away from its foot.

a. 30 b. 0

c. 90 d. 60

13. If U be the set of all triangles in a plane, and A is the set of all triangles with

at least one angle different from 60 then A’ is :-

a. All triangles in a plane

b. Set of all equilateral triangles

c. Set of all triangles except equilateral triangle

d. None of the above

14 Integration of Cosec(ax+b)Cot(ax+b) is = ?

a. –Cosec(ax+b) b. –Cot(ax+b)

c. –[Cosec(ax+b)] / (ax+b) d. –[Cosec(ax+b] / a

15 Sum of the Sequence 15+24+33+42+51+60+69+78+87+96 is

a. 500 b. 505

c. 550 d. 555

16 In a quadratic equation if b2 < 4ac the roots are :

a. Real b. Equal

c. Imaginary d. Unequal

17. Value of Cos1.Cos2.Cos3.Cos4 . . . . . . . . . . . . . . . . . . . . Cos180 is

a. 0 b. 1

c. 1/?2 d. ?3/2

18. If any two rows or columns of a Determinant are identical, the Value of the D e Determinant becomes

a. 1 b. 0

c. No Change d. –1

19. 101th term of an A.P. of the function [n(n+1)] / (2n-1) is :

a. 50.36 b. 50.24

c. 50.45 d. 50.13

20. In a group of 65 people, 40 like Cricket, 10 like both Cricket & Tennis. How many of them like only Tennis and not Cricket?

a. 25 b. 35

c. 65 d. 40

21. Do you speak English?

a. Is a Statement.

b. Is a Declarative Sentence and Statement.

c. Is a Declarative Sentence but not a Statement.

d. None of the Above.

22. Differentiation of Cos3x is

a. –3Cos2xSinx b. 3Cos2x

c. 3Cos2xSinx d. –3CosxSinx

23. Simple Interest on Rs. 650 for 8 Months at the rate of 5 paise per rupee per month is

a. 65 / 3 b. 260

c. 280 d. 360

24. For an A.P., a1,a2,a3,a4,- – – – – – – – – -if a4 / a7 = 2/3 then a6 / a8 will be :

a. 3/2 b. 4/6

c. 5/4 d. 4/5

25. Value of –15 . 17 . –1-3 . 1-8 is :

a. 0 b. 1

c. –1 d. Infinity

26. A software firm provides the following three characteristics for each program that it sells:

Language : FORTRAN (f) ; PASCAL(p) ; LISP(l)

Memory : 2meg(2) ; 4meg(4) ; 8meg(8)

Operating System: UNIX (u) ; DOS (d)

The number of Categories in this Classification is :

a. 18 b. 19

c. 7 d. None of the Above

27. For Real and Equal Roots the value of the Determinant :

a. D > 0 b. D< 0

c. D ?= 0 d. D = 0

28. For what values of ‘a’ does the Linear Equation :

ax + 8y + 6 = 0 & 2x + (a-1)y – 7 = 0 have Unique Solution?

a. Values 4, 17, -4

b. Values between –4 and 17

c. Values other than 4, -4, 17

d. None of the Above

29. If A = {a, b, c, d} and R be the Relation on A, whose Matrix is : 1 0 0 0

then R will be: 0 1 0 0

a. {(a,a),(a,b),(a,c)(a,d),(b,b),(c,c),(d,d)} 1 1 1 0

b. {(a,a),(a,c),(b,b),(b,c),(c,c),(d,d)} 0 1 0 1

c. {(a,a),(a,c),(b,b),(b,c),(b,d),(c,c),(d,d)}

d. {(a,a),(a,c),(b,b),(b,c),(b,d),(c,c),(c,d),(d,d)}

30. Which term in the given Sequence is wrong?

10, 20, 40, 70, 120, 160

a. 40 b. 120

c. 160 d. 70

31. A Sum of Rs. 2000 is invested at 16% rate of interest per annum. What will be the Amount after 2 years if the interest is Compounded Semi – annually?

a. Rs.2361.20 b. Rs.2163.20

c. Rs.2136.20 c. Rs.2613.20

e. Rs. 2720.98

32. If A = {a, e, i, o, u}

a. a ? A b. a ? A

c. a ? A c. None of the Above

33. Integration of e5x

a. 5e5x b. 5e4x

c. e5x / 5 d. e5x

34. If the Graph of two Linear Equations represents a Single Line then the Solution for the graph is

a. Consistent b. Inconsistent

c. Unique d. None of the Above

35. Value of 2 Sin2? + Cos2? is = ?, where 45º

a. 3 / 2 b. 2

c. 2 / 3 d. 3 / ?2

36. If the difference between Simple and Compound Interest on a Sum of Money for 4 years at 5% per annum is Rs. 150 the Sum will be:

a. Rs.9637.52 b. Rs.9763.25

c. Rs.9367.25 d. Rs.9673.52

37. If A = 5 4 A-1 will be equal to

7 6

a. 5 7 b. –3 7/2

4 6 2 -5/2

c. 3 7/2 d. 3 -7/2

2 5/2 -2 5/2

38. Differentiation of tan2x w.r.t. cos2x is:

a. tan2xcos2x b. sec4x

c. –sec4x d. tan2x/cos2x

39. Value of (81 / 256)-5/4 is:

a. 3 / 2 b. –1024 / 243

c. 1024 / 243 d. –3/2

40. Integration of (2x-3)2

a. 4/3×3-6×2+9x

b. 4/3×2-6x+9

c. 3/4×3-6×2+9x

d. 3/4×3-6×2+9

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