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by trial and error method
for example :
3^2 =8q+1 =>q=1
5^2=8q+1=>q=3
an so on .......
therefore square of any odd number is of the form 8q+1
for example :
3^2 =8q+1 =>q=1
5^2=8q+1=>q=3
an so on .......
therefore square of any odd number is of the form 8q+1
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