Show that 21n cannot end with digit 0 for any natural no n
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Answered by
2
Step-by-step explanation:
21n=(3×7)n .....
in order to get 0 the number should have a multiple of 2 and 5 ....
Thus 21n can't end with digit 0........
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Answered by
1
Answer:
21 = 7 × 3
21 does not have either 5 or 2 as a factor
therefore 21n cannot end with 0 for any natural number n
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