How many 5 digit telephone numbers can be constructed
Asked by admin @ in Math viewed by 372 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?
Asked by admin @ in Math viewed by 372 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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