Question
A seven digit telephone number is of the form ABC-DEFG. In one particular state, the digit 'A' can be any digit except 0 and 1.
A seven digit telephone number is of the form ABC-DEFG. In one particular state, the digit 'A' can be any digit except 0 and 1. The digits B and C can be any digit from 2-9. The digits D,E, F, and G can be any digit 0-9 except they can't all be the same (e. g. 0000, 1111, 2222,....etc). How many seven digits phone numbers are possible with these restrictions?
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The Art Of Proof Basic Training For Deeper Mathematics
Authors: Matthias Beck, Ross Geoghegan
1st Edition
1441970231, 9781441970237
