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Show that 21^n, n €N can never ends with 0,2,4,6 and 8

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Show that 21^n, n €N can never ends with 0,2,4,6 and 8...

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Show that 21^n, n €N can never ends with 0,2,4,6 and 8​

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Show that 21^n, n €N can never ends with 0,2,4,6 and 8