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Difficulty:
5%
(low)
Question Stats:
86% (00:49) correct
14%
(01:19)
wrong
based on 123
sessions
History
Date
Time
Result
Not Attempted Yet
What is the unit digit of \(4387^{245}*621^{72}\) ?
(A) 1
(B) 2
(C) 5
(D) 7
(E) 8
_________________
(A) 1
(B) 2
(C) 5
(D) 7
(E) 8
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This question is recurrent in the GMAT official guide books.
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Posts: 1,070
Bunuel
Units digit of 621^anything is 1, so we can just ignore that part.
\(4387^{245}\)
7^something cycles 7, 9, 3, 1. B, C, and E are out.
Is 245 a multiple of 4? Nope. A is out.
Answer choice D.
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