PERMUTATION & COMBINATION (Concept + All type of Problems) 

Permutation Formula :-
Permutation is defined as arrangement of r things that can be done out of total n things. This is denoted by nPr which is equal to n!/(n-r)!
Combination formula :-
1. Combination is defined as selection of r things that can be done out of total n things. This is denoted by nCr which is equal to n!/r!(n-r)!
2 As per the Fundamental Principle of Counting, if a particular thing can be done in m ways and another thing can be done in n ways, then either one of the two can be done in m + n ways and both of them can be done in m × n ways.
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