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What digit appears in the units place in the number obtained when

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What digit appears in the units place in the number obtained when  [#permalink]

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New post 13 May 2016, 03:48
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A
B
C
D
E

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Question Stats:

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What digit appears in the units place in the number obtained when  [#permalink]

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New post Updated on: 13 May 2016, 23:59
Q: Units digit of 2^320

Remainder when power/4 = 320/4 is 0. Hence the number will have units digit same as 2^4 which is 6.

OA : D

Originally posted by babuvgmat on 13 May 2016, 07:54.
Last edited by babuvgmat on 13 May 2016, 23:59, edited 1 time in total.
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Re: What digit appears in the units place in the number obtained when  [#permalink]

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New post 13 May 2016, 23:39
Bunuel wrote:
What digit appears in the units place in the number obtained when 2^320 is multiplied out?

A. 0
B. 2
C. 4
D. 6
E. 8


\(2^{320}\) = \(2^{4*80}\)

2^4 WILL HAVE UNITS DIGIT AS 6

So,\(2^{320}\)will have \(6^{80}\) will also have units digit as 6

Answer will be (D) 6
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Re: What digit appears in the units place in the number obtained when  [#permalink]

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New post 14 May 2016, 00:20
2^320=2^4K
put k=1
last digit of 2^4=16
last digit 6

Answer=> D) 6
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Re: What digit appears in the units place in the number obtained when   [#permalink] 14 May 2016, 00:20
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