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
OA is 12
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
