littlemisschris
23.08.2019 •
Mathematics
Aseven digit telephone number is of the form abc-defg. in one particular state, the
digit ‘a’ can be any digit except 8 and 9. the digits b and c can be any digit from 1 - 8.
the digits d, e, f, and g can be any digit 0 – 9 except they can’t all be the same (e.g.
, , , …. how many seven digit phone numbers are possible with
these restrictions?
5,120,000
5,114,880
4,608,000
10,000,000
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