How many 5 digit telephone numbers can be constructed


Asked by admin @ in Math viewed by 375 People


How many 5-digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?

Answered by admin @



There are 10 digits from 0 to 9

I place after 67 can be filled in 8 ways.

II place after 67 can be filled in 7 ways.

III place after 67 can be filled in 6 ways.

∴ No of telephone numbers that can be constructed.

⇒8×7×6

⇒336


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