2. A local telephone number is a sequence of, №15231916, 22.01.2021 15:10

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Mathematics: 2. A local telephone number is a sequence of seven digits. For example, 899-3782 is a local seven-digit telephone number. The first digit cannot be a or a 1. If this is the only restriction, then how many local seven-digit telephone numbers are possible?

Bhaskar Singh Bora Mathematics, Physics. Q&A Expert · Accepted Answer

0,1,2,3,4,5,6,7,8,9 10 digits in all the first digit can be chosen from only 8 digits (no 0 or 1)....

2. A local telephone number is a sequence of seven digits. For example, 899-3782 is a local seven-digit telephone number. The first digit cannot be a or a 1. If this is the only restriction, then how many local seven-digit telephone numbers are possible?

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