Question

The remainder when 81785 is divided by 7 is :
(1) 5
(2) 1
(3) 6
(4) can't be determined

Answer 1

1 is the remainder as sum of all digits is 29 which when divided by 7 leaves 1 as remainder

Answer 2

Solution:

To check if a number is divisible by 7 than take the last digit of the number, double it Then subtract the result from the rest of the number If the resulting number is completely divisible by 7, than only the original number is divisible by 7.

As it is too a complex process,in that time one can divide the number by 7

$= \frac{81785}{7} \\ \\ = 11683 \frac{4}{7}$
On dividing the number by 7 we get the remainder 4,which is not in the option.

and we can't be write that it cannot be determined.

Remainder = 4

Hope it helps you.