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# How Many Primes?

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### #1 Morningstar

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Posted 14 February 2013 - 04:02 PM

Just a quick math problem that shouldn't take too long.

The digits 0-9 can be arranged into 3,628,800 distinct 10-digit numbers (including a leading 0). Of these, how many are prime?

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The cake is a lie.

### #2 k-man

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Posted 14 February 2013 - 04:22 PM   Best Answer

Spoiler for

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### #3 Morningstar

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Posted 14 February 2013 - 04:30 PM

Spoiler for

Wow. That was fast. Good job!

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The cake is a lie.

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