SOLUTION: How many 7 digit numbers can be made from the numbers 2,2,2,4,4,5,5,6?

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Question 711112: How many 7 digit numbers can be made from the numbers 2,2,2,4,4,5,5,6?
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
total 8 digits are there
so no of 7 digit no's = 8p7 / 3 ! * 2!*2!
=1680