gmatt1476 wrote:
If n = p^2 and p is a prime number greater than 5, what is the units digit of n^2 ?
A. 1
B. 3
C. 4
D. 7
E. 9
PS37402.01
p is a prime number greater than 5.
n is a perfect square.
p could be 7 , 11, 13
n could be .......49, 121, 169.
unit digits of \(n^2\):
\(49^2 = 1\)
\(121^2 = 1\)
\(169^2 = 1\)
A is the correct answer.