Mathematics
Bois553
20

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 for 2-9. The digits D,E,F, and G can be any digit 0-9 except they can't all be the same. How many seven digit phone numbers are possible with these restrictions?

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(1) Answers
andre84151

8 possibliess for A 8 for B 10 for D 9 for E since you used one for D 8 for F because you used two for E and D 7 for G becase y ou used three for E, F and D so 8*8*10*9*8*7=322560 different phone numbers

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