Question

Permutation question:- In how many ways can 4 letters be put in 3 envelops?​

Answer 1

Answer:60 ways

Step-by-step explanation:

We take a letter. It can be posted in any of the 4 boxes. Similarly, next letter can be posted in 4 ways, and so on. Total number = 4  

3

 

But there are 4 such cases in which each Box can contain all 3 letters  

So, we have to remove 4 such cases  

Hence, No of ways required =4  

3

−4=64−4=60