Remainder????????????????????

What is the remainder when (2^999)/7 If the remainder is R Then what is the value of A If A = R + R^2 +R^3 +.................R^n

n-2 n n^2 n-1

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3 solutions

this can be done like ,

8^333 / 7

i.e

(7 + 1)^333 / 7

this is

(7 + 1)(7 + 1)(7 + 1)..............(7 + 1) / 7

now when u can treat 7 as x...

(x + 1)(x + 1)....................(x + 1) / x

now when u open it all the terms will be a multiple of x i.e 7 except the last term ie 1.

so the multiples of 7 will not leave any remainder and 1 will itself lead to a remainder 1....

hence R = 1

A = 1 + 1^2 ....... 1^n A = n

A very refreshing approach !!

Arijit ghosh Dastidar - 6 years, 3 months ago

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Thanx bro ..

Divyansh Chaturvedi - 6 years, 3 months ago

still... yours is quite "BRILLIANT" !!!

Sarthak Rath - 6 years, 3 months ago
Sarthak Rath
Feb 23, 2015

i i d i d did i t it l i k e like t h i s : this: 2 3 1 ( m o d 7 ) 2^3 \equiv 1 \pmod{7}

\Rightarrow 2 999 1 ( m o d 7 ) 2^{999} \equiv 1 \pmod{7}

t h u s thus a s as w e we s e e , see, w e we g e t get 1 1 a s as r e m a i n d e r . . . . remainder....

h e n c e , hence,

A = 1 + 1 + 1..... n t i m e s = 1 n = n A=1+1+1..... n times = 1*n = n

Anshul Sanghi
Feb 13, 2015

Remainder will be 1 so the value of A will be n.

@Anshul Sanghi how did you calculated the remainder??

Harsh Shrivastava - 6 years, 4 months ago

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