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What is the unit digit of

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SVP
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What is the unit digit of  [#permalink]

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New post 16 Oct 2017, 14:09
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

80% (00:51) correct 20% (00:44) wrong based on 46 sessions

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What is the unit digit of \(\frac{(5! 4!+6! 5!)}{3!}\) ?

1) 4
2) 3
3) 2
4) 1
5) 0
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What is the unit digit of  [#permalink]

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New post 16 Oct 2017, 15:54
Mo2men wrote:
What is the unit digit of \(\frac{(5! 4!+6! 5!)}{3!}\) ?

1) 4
2) 3
3) 2
4) 1
5) 0

Every factorial greater than 4! has a units' digit of 0.

So (units' digits ONLY)

\(\frac{(0)(4) + (0)(0)}{6} =\frac{0}{6} = 0\)

Answer E
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Re: What is the unit digit of  [#permalink]

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New post 16 Oct 2017, 23:01
3! is 6.
Your first doubt would be whether numerator is divisible by 6 or not.

5! would give you a 0 in unit digit and is divisible by 6
So 0 + 0, would give you 0.
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Re: What is the unit digit of &nbs [#permalink] 16 Oct 2017, 23:01
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