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

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Question

Advance Math

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

eight and

?(a) only even digits may be? used?

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

?(c) the number must be a multiple of 1,000?

?(d) the first 2 digits are 92?

?(e) no repetitions are? allowed?

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