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Topic: Combination/Permutation Problem
Replies: 3   Last Post: Nov 29, 2011 8:42 PM

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Federico

Posts: 4
From: buenos aires
Registered: 9/8/11
Combination/Permutation Problem
Posted: Nov 29, 2011 3:04 PM
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Hello can anyone help me with this question...

Assuming a 7 digit telephone number is in the form NXX-XXXX where N=(2-9) and X=(0-9).
How many have exactly 3 zeroes?



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