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The expression 15^4-7^4 is divisible by

Option: 1

3


Option: 2

6


Option: 3

9


Option: 4

11


Answers (1)

best_answer

 

 

Principle of Mathematical Induction -

-

15^4-7^4=(15+7)(15-7)(15^2+7^2)

=22*8*(225-49)

=22*8*176

Since (15^2+7^2) is divisible by 11

Posted by

Irshad Anwar

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