will be divisible by

- a)25
- b)8
- c)7
- d)3

Correct answer is option 'C'. Can you explain this answer?

Related Test: WBJEE Mathematics Sample Paper II

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! ! !

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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