How many seven-digit telephone numbersbegin with 538- and


Question: 1. How many seven-digit telephone numbers

(a) begin with 538-?

(b) begin with 538- and have 4 different numbers in the remaining digits?

(c) begin with 538- and contain a 9, a 6, and a 2?

2. Is K3 a sub graph of the Petersen graph? Explain.

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Mathematics: How many seven-digit telephone numbersbegin with 538- and
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