a,b and c are positive integers and b

Question

a,b and c are positive integers and b sqrt(a) Have fun - OA soon

walker · Answer

A.

1. a^2/b^2 = 1. k^2 (where k - integer) or 2. fraction

therefore, neither fraction nor k^2 can not be prime. suff

2. any c. insuff.

spider · Answer

Walker dint understand your answer...could you please explain?

KillerSquirrel · Answer

the OA is (A)

walker · Answer

1. n=a^2/b^2

there are two cases:
a) n-integer
In this case n must be equal k^2 where k - integer. n is not prime. For example. a=5*3*7*2*13, b=5*3*2*13 ==> n=7^2
b) n-fraction ==> n is not also prime
suff

a,b and c are positive integers and b < a Is a^2/b^2 = c

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