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# Quantitative Aptitude: Practice questions on Functions

Oct 20, 2015 17:54 IST

Quantitative Aptitude Practice questions on Functions: This practice set has 8 questions with their answers & Explanatory answer covering topics from the areas of Quantitative Aptitude.

1. How many onto functions can be defined from the set A = {1, 2, 3, 4} to {a, b, c}?

A. 81

B. 79

C. 36

D. 45

2. f(x + y) = f(x)f(y) for all x, y, f(4) = +3 what is f(-8)?

A. 1/3

B. 1/9

C. 9

D. 6

3. Find the maximum value of f(x); if f(x) is defined as the Min {-(x – 1)2 + 2, (x – 2)2 + 1}

A. 1

B. 2

C. 0

D. 3

4. Consider functions f(x) = x2 + 2x, g(x) = and h(x) = g(f(x)). What are the domain and range of h(x)?

A. 1

B. 2

C. 0

D. 3

5. [x] = greatest integer less than or equal to x. If x lies between 3 and 5, what is the probability that [x2] = [x]2?

A. Roughly 0.64

B. Roughly 0.5

C. Roughly 0.14

D. Roughly 0.36

6. Give the domain and range of the following functions:

A. f(x) = x2 + 1

B. g(x) = log(x + 1)

C. h(x) = 2x

D. f(x) = 1/(x+1)

E. p(x) = |x + 1|

F. q(x) = [2x], where [x] gives the greatest integer less than or equal to x

7. How many elements are present in the domain of 9–xCx+1?

A. 5

B. 6

C. 4

D. 7

8. f(x + y) = f(x)f(y) for all x, y, f(4) = + 3 what is f(–8)?

A. 1/3

B. 1/9

C. 9

D. 6

1. C

2. B

3. B

4. Domain: ( -∞, +∞), Range -[0, ∞]

5. C

6. ----

7. B

8. B

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