Question

1. If n(A x B) = 6 and A = {1,3} then n(B) is

1) 1 2) 2 3) 3 4) 6

2. A = {a,b,p}, B = {2,3} C = {p,q,r,s} then n[(A ∪C) x B] is

1) 8 2) 20 3) 12 4) 16

3. If there are 1024 relations from a set A = {1,2,3,4,5} to a set B, then the number of elements in B is

1) 3 2) 2 3) 4 4) 8

4. If the ordered pairs (a + 2,4) and (5, 2a+b) are equal then (a,b) is

1) (2, -2) 2) (5, 1) 3) (2, 3) 4) (3, -2)

5. If {(a,8), (6,b)} represents an identity function, then the value of a and b are respectively

1) (8,6) 2) (8,8) 3) (6,8) 4) (6,6)

6. If f(x) = 2x2

and g(x) = 1

3x

, then f o g is

1) 2

3

2x

2) 2

2

3x

3) 2

2

9x

4) 2

1

6x

7. If f : A→B is a bijective function and if n(B) = 7, then n(A) is equal to

1) 7 2) 49 3) 1 4) 14

8. Let f(x) = 2

1 x + then

1) f (xy) = f (x). f (y) 2) f (xy) ≥ f (x). f (y)

3) f (xy) ≤ f(x). f(y) 4) None of these

9. If g = {(1,1), (2,3), (3,5), (4,7)} is a function given by g (x) = αx+β then the values of α and β are

1) (-1,2) 2) (2, -1) 3) (-1,-2) 4) (1,2)

10. f (x) = (x + 1)3

– (x – 1)3

represents a function which is

1) linear 2) cubic 3) reciprocal 4) quadratic​

Answer 1

Answer:

vry vry vry tough I could not

Answer 2

Answer:

it's a too difficult question