Check whether 20^n can end with digit 5 for any natural number
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https://www.meritnation.com/ask-answer/question/check-whether-26-n-can-end-with-the-digit-5-for-any-value-of/real-numbers/2146651
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https://www.meritnation.com/ask-answer/question/check-whether-26-n-can-end-with-the-digit-5-for-any-value-of/real-numbers/2146651
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