Re: Show congruent


Gaurav1146 wrote:
Any positive integer can be written as 4k,4k+1,4k+2 or 4k+3 where k is
a non negative integer.
(4k)^2 = 0 mod 8
(4k+1)^2 = 1 mod 8
(4k+2)^2 = 4 mod 8
(4k+3)^2 = 1 mod 8
Hence the square of an integer is congruent to 0,1 or 4 mod 8.

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