will be divisible by 
  • a)
    25
  • b)
    8
  • c)
    7
  • d)
    3
Correct answer is option 'C'. Can you explain this answer?

JEE Question

By Babita Devi · Oct 05, 2020 ·JEE
4 Answers
Rashid Dar answered Oct 05, 2020
Put the value of n =1.The answer comes 8 - 1 = 7. then divided 7 by 7 the answer comes 1it means 7 is the correct answer.

Subas answered Oct 26, 2020
To answer it in a simple,
Just substitute some value to 'n'
Let's say n=1,then
(2^3(1)-1) gives 7 which can only be divided by 7 and there we go! ! !

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