Math Is Fun Forum

  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#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.

Board footer

Powered by FluxBB