Permutations and Combinations


Multiple Principle or Fundamental Principle of Counting: If an event can occur in m different ways, following which another event can occur in n different ways, then the total number of occurrence of the events in the given order is m x n.
Addition principle: If there are two mutually exclusive e
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A combination is a selection made by taking some or all of a number of objects, irrespective of their arrangements. The number of all combinations of n distinct objects, taken r at a time is denoted by ncr or c(n, r).
The number of combination of n different things taken r at a time is given by n
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