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2) If n is a +ve integer, what is the units digit of n A)

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Manager
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2) If n is a +ve integer, what is the units digit of n A) [#permalink] New post 17 Oct 2007, 07:18
2) If n is a +ve integer, what is the units digit of n
A) The units digit of 11^n is 4
B) Hundreds digit of 5^n is 6.

Pls explain how units digit of 11^n can be 4 in A.

I got E. Any other answers?
Manager
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 [#permalink] New post 17 Oct 2007, 08:28
i dont get it, the units digit of 11^n can never be 4 when n is a positive integer.
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 [#permalink] New post 17 Oct 2007, 18:11
It's E ...

5^5 = 625
5^7 = 15,625 , and this doesn't work...
  [#permalink] 17 Oct 2007, 18:11
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2) If n is a +ve integer, what is the units digit of n A)

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