If n is a rational number, then 52n − 22n is divisible by
A. 3
B. 7
C. Both 3 and 7
D. None of these
Answer:C
If n is a rational number, then 52n − 22n is divisible by
A. 3 B. 7 C. Both 3 and 7 D. None of these
Explanation: 52n −22n is of the form a2n − b2n which is divisible by both (a + b) and (a – b).