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How many five digit numbers can be formed using digits 0, 1, 2, 3, 4

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Joined: 10 Aug 2018
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Re: How many five digit numbers can be formed using digits 0, 1, 2, 3, 4  [#permalink]

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New post 31 Jul 2019, 06:24
Took 4 mins. Very bad.

Sum of digits must be divisible by 3 to make a number divisible by three.

Dropping 0, we have 5 4 3 2 1 which can be arranged in 5! ways i.e. 120 ways

Dropping 3, we have 5 4 2 1 0 which can be arranged in 4x4x3x2x1= 96 ways

Total 216 ways.
E is the answer.

But how to improve my timing for this I don't know.
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Re: How many five digit numbers can be formed using digits 0, 1, 2, 3, 4   [#permalink] 31 Jul 2019, 06:24

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