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# find unit digit of [m]1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 +

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find unit digit of [m]1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 +  [#permalink]

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20 Feb 2019, 23:11
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:22) correct 0% (00:00) wrong based on 2 sessions

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find unit digit of $$1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 + 8!^8 + 9!^9 + 10!^{10}$$

A) 1
B) 3
C) 5
D) 7
E) 9

Source: www.GMATinsight.com

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Joined: 02 Sep 2009
Posts: 53738
Re: find unit digit of [m]1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 +  [#permalink]

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20 Feb 2019, 23:23
GMATinsight wrote:
find unit digit of $$1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 + 8!^8 + 9!^9 + 10!^{10}$$

A) 1
B) 3
C) 5
D) 7
E) 9

Source: http://www.GMATinsight.com

You've posted this one before: https://gmatclub.com/forum/find-out-the ... fl=similar

Archiving.
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Re: find unit digit of [m]1!^1 + 2!^2 + 3!^3 + 4!^4 + 5!^5 + 6!^6 + 7!^7 +   [#permalink] 20 Feb 2019, 23:23
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