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In a certain city, all telephone numbers have six digits, the first two digits always being 41 or 42 or 46 or 62 or 64. How many telephone numbers have all six digits distinct?
Answers (1)
If first two digit is 41, the remaining 4 digits can be arranged in ways=
In addition, if first two digits are 42, 46, 62 or 64 the remaining 4 can be arranged in ways=
ways.
So, total number of telephone numbers having all 6 digits different =
View full answer
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