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last digit of

by sanju09 » Thu Aug 12, 2010 3:27 am
The last digit of 253^49 is
(A) 1
(B) 3
(C) 6
(D) 7
(E) 9


[spoiler]Source: for www.avenuesabroad.org

edited for not minding the order of answer choices originally[/spoiler]
Last edited by sanju09 on Thu Aug 12, 2010 3:57 am, edited 1 time in total.
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by kvcpk » Thu Aug 12, 2010 3:40 am
sanju09 wrote:The last digit of 253^49 is
(A) 1
(B) 3
(C) 7
(D) 6
(E) 9


[spoiler]Source: for www.avenuesabroad.org[/spoiler]
3^1 ends in 3
3^2 ends in 9
3^3 ends in 7
3^4 ends in 1
Cycle repeats.

49/4 = 1
Hence 3^49 will end in : 3
pick B
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