In how many ways the corners of a square be colored using four colors? 1. If repeat of the colors is allowed. 2. If repeat of the colors is not allowed.
There are 12 different chocolates placed on a table along a straight line. In how many ways can a person choose 4 of them such that no 2 of the chosen chocolates lie next to each other?
There are 3 boys and 4 girls. We have to arrange any 1 boy at the center and any 2 girls at corners. In how many methods these persons can be arranged.
