SOLUTION: How many different 7 digit telephone numbers contain three 8s, two 6s, one 5 and one 4?
I did 7! x 3! x 2! x 1! x 1!=60480
Is this correct?
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-> SOLUTION: How many different 7 digit telephone numbers contain three 8s, two 6s, one 5 and one 4?
I did 7! x 3! x 2! x 1! x 1!=60480
Is this correct?
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Question 578866: How many different 7 digit telephone numbers contain three 8s, two 6s, one 5 and one 4?
I did 7! x 3! x 2! x 1! x 1!=60480
Is this correct? Answer by richard1234(7193) (Show Source):
You can put this solution on YOUR website! Not quite. In order to account for the fact that the three 8's are indistinguishable, you have to divide by 3!, not multiply. The number of ways is
