Question

If p be a prime number and p divides a power 2 then p also divides - where a is a positive integer

Answer 1

Answer:

Let us consider p=5,a=25

p divides a

2

=

p

a

2

=

5

625

=125

p divides a,

p

a

=

5

25

=25

So, a is a positive integer.

From the given options, only A fits our choice.

Therefore, A is the correct answer.