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#1 Re: Help Me ! » Combinations and Permutations Calculator » 2012-07-31 20:02:26

passegua

Wow, that's right!
Many thanks.
D.P.

#2 Help Me ! » Combinations and Permutations Calculator » 2012-07-30 21:07:28

passegua
Replies: 4

I am using the powerful Combinations and Permutations Calculator, but
I cannot perform this problem:

How many 6 digit number could I write that:
1) no zeroes
2) exactly two times the digit "1"
3) exactly two times the digit "2"

Anyone could help me?

Which formula could sort this out?

Many thanks.

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