11 C 5
=== 462
When rolling 10 dice with 2020 faces each (numbered 1 to 20), how many ways are there of rolling a total sum of 15?
In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?
There are 5 mangoes and 6 bananas. In how many different ways can a selection of fruits be made if all fruits of same kind are numbered with different tags.