The probability that out of 10 person, all born in June, at least two have the same birthday.
Please answer...

0.815361224

2

This problem can be done like this

desirable cases/sample space =1- undesirable cases/sample space

i.e.,1- 30x29x28x27x26x25x24x23x22x21/30x30x30x30x30x30x30x30x30x30=0.81536122

The answer is 20% as 2/10*100=20% or by using sample space