Question

show that 21^n can not end with digits 0,2,4,6,8for any naturL number ' n'​

Answer 1

if 21 n ends with 0,2,4,6&8 it would have 2 as it's factor but factors of 21 are 3 and 7.

hence, 21n cannot end with the digit 0,2,4,6and 8for any natural number n

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Answer 2

Answer:

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