Question

Number of factors of A, B, C and D are 4, 5, 6 and 7 respectively. Then which of the following are
perfect squares.
(A) A and B
(B) C and D
(C) A and C
D)B and D​

Answer 1

Answer:

answer is option d

as numbers that are perfect squares have odd number of factors and numbers which aren't have even number of factors.

for example non perfect squares have unique numbers as their factors( means different numbers ) while in perfect square one number is repeated

example

6 - 1, 2, 3, 6

9- 1, 3, 9