Question

$23^7-15^7$ is completely divisible by

• A. 11
• B. 4
• C. 7
• D. 3

Answer 1

Answer:

B. 4

find 23 - 15 23 - 15 = 8 8 is not given in the option But 8 is completely divisible by 4 so 23^ 7 - 15^7 is completely divisible by 4