Question

Answer to
questions 4 and 6

Answer 1

Two numbers are said to be co-prime if their H.C. F is 1.

Now, it is given that a, b are co-prime numbers.

So, HCF (a,b) = 1

Now, when the two numbers are a2 and b2, then also their HCF = 1 , because the factor of a2 would be 1, a and a2 whereas factor of b2 would be 1,b and b2.

Hence, HCF (a2,b2) = 1

Hence, the number a2, b2 are said to be co-prime numbers.

4 ans is (A)

6 ans is (C)

because

$(2 \times 5) = 10$

and n can be any number 10 ^n will always end with zero.