check whether
can end with digit zero for any natural number n
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no 15^n can't end with zero for any natural number
if you put 0 in place of n
you will get 1
and if you put any other natural number it will always end with 5
because 5×5..n times will have 5 in unit place
if you put 0 in place of n
you will get 1
and if you put any other natural number it will always end with 5
because 5×5..n times will have 5 in unit place
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