I can't see any answer besides A. ..
Note that it cannot be zero because otherwise, n would be a multiple of 7.
Is there a simple explanation for this?
The positive integer is not divisible by . The remainder when is divided by 7 and the remainder when is divided by are each equal to . What is ?
E. It cannot be determined from the information given.
I just looked at the middle part and concluded the answer to be 1. The only numbers I know that are equal to their squares are 0 and 1. Zero isn't available.
Let's say our number can be written as:
We actually have to keep in mind, that we are trying to evaluate itself and only remainder of when it's divided by 7.
However, in your case there really are no other possible scenarios other than (you can run through to make sure of that).