Prove that the square of any positive integer is in the form 5m, 5m,5m+4
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let positive integer be a&b
a=bq+r 0<=b<r
b=5 r=0,1,2,3,4
5q=(5q)^2
25q^2
5(5q^2)
5m
a=bq+r 0<=b<r
b=5 r=0,1,2,3,4
5q=(5q)^2
25q^2
5(5q^2)
5m
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