These are usually first studied for the purpose of computing probabilities, but they are fundamental mathematics and come often in many different contexts.
(b) A tea party is arranged for 16 persons along two sides of a table with 8 chairs on each side. 4 persons wish to sit on on particular side and 2 on the otherside. In how many ways can they be...
A permutation is an arrangement of objects in some specific order. Permutations are regarded as ordered elements. A selection in which order is not important is called a combination. Combinations are...