Iliana R.

asked • 11/15/19

MATH 1324- 8.1 HW

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

six and

​(a) only even digits may be​ used?

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

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

​(d) the first 3 digits are 478​?

​(e) no repetitions are​ allowed?




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