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Q-44

by engg.manik » Sat Oct 10, 2009 5:43 am
44.A 4-digit telephone number consists of 3, 4, and 5. If 4, 5 can be used exactly one time, 3 can be used two times, how many such numbers are possible?

OA is 12
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by dmateer25 » Sat Oct 10, 2009 6:38 am
Here is my reply from an older post:

This question basically asks how many ways can we arrange the numbers 3345

To find the number of permutations of n objects of which r are duplicates, calculate n!/r!

4!/2! = 12

https://www.beatthegmat.com/prob-t29128.html
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