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04 Jul 2022, 12:45
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
86% (00:48) correct
14%
(01:19)
wrong
based on 119
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
04 Jul 2022, 16:10
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This question is recurrent in the GMAT official guide books.
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5ADD57AA-E7AB-462E-8C55-41F21EC297DB.jpeg [ 231.91 KiB | Viewed 3466 times ]
04 Jul 2022, 16:15
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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.
