How many 7-digit telephone numbers are possible if the first digit cannot be eight and (a)...

How many 7-digit telephone numbers are possible if the first digit cannot be

eight and

(a) only even digits may be used?

(b) the number must be a multiple of 10 (that is, it must end in 0)?

(d) the first 2 digits are 92?

(e) no repetitions are allowed?

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Expert Solution

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Colby Messinger answered 1 year ago

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How many​ 7-digit telephone numbers are possible if the first digit cannot be eight and ​(a)...

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How many 7-digit telephone numbers are possible if the first digit cannot be eight and (a)...