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Get the last digit (
Posted on 20110117
)
Let A=2^n+3^n+7^n
For a given positive integer n what is the last digit of A?
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Submitted by
Ady TZIDON
Rating:
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(2 votes)
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Solution
 Comment 1 of 2
There may be a more compact way to state this but due to the repeating nature of the last digits of the powers of 2, 3, & 7,
the last digit of the sum is
8 for n mod4=3 or 0
2 for n mod4=1 or 2
Posted by
Kenny M
on 20110117 16:01:52
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