In how many, ways can 5 boys and 5 girls be placed in a circle,so( that no two boys are side by side?

In how many ways can 7 boys and 5 girls be arranged in a row so that no two girls come together?

In how many ways can 5 boys and 3 girls stand in a row such that no two girls are together?

In how many ways can one post 3 letters in 5 post boxes?

A group consists of 4 girls and 7 boys.Ion how many ways can a tean of 5 members be selected so that the team has at least one boy and one girl?

There are 7 boys and 3 girls in a class. In how many ways can they be arranged in a row such that no two girls are together?

How many tangents can you draw on a circle.

How many chords can be drawn through 21 points on a circle?

In how many ways can seven person be seat in a row of seats if two persons insist on sitting next to each other?

How many tangents can a circle have?

In how many ways can 10 scrips be arranged, so that the best and the worst do not come together?