Question

3. If : → is a bijective function and if n(B)=7 then n(A)is equal to
a) 7 b) 49 c) 1 d) 14

Answer 1

Answer:

2. If n (A × B) = 20 and n(A) = 5 then n(B) is : a) 5 b) 4

c)3 d)2

3. Relations are subsets of ______; Functions are subsets of

_______a) Cross product, Relations b) Relations, cross

product c) Cross product, Functions d) Functions, cross

product

4. If x≠ 1 and f(x) = +1

−1

is real function, then f(f(f(2))) is:

a) 1 b)2 c)3 d)4

5. A relation R is defined from {2,3,4,5} to {3,6,7,10} by : x R y

⇔x is relatively prime to y. Then, domain o