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What is the remainder if $2781^{5335}$ is divided by $20$?

Suppose there are N real numbers, any N-1 of which can be devided into two groups so that the sum of the elements of each group are equal. Is N ...

Suppose there are 2N+1 numbers. Any 2N numbers of them can be devided into two groups, each group has N elements, so that the sum of the elements of ...

Given :

$p$ is an odd prime number.

$x, y$ are positive integers.

$p=x^2+y^2$.

What can you conclude from this?

Given:

What can you conclude from here?

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