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How Many Primes?

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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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None. They are all divisible by 3 and 9 (the sum of 1 through 9 is 45 and is divisible by 3 and 9)

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Posted · Report post

None. They are all divisible by 3 and 9 (the sum of 1 through 9 is 45 and is divisible by 3 and 9)

Wow. That was fast. Good job!

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