permutation and combination ca foundation module questions exercise 5 (A)

                     permutation and combination

the fundamental principle of counting there are two types of principle.

1. multiplicative rule.
2. addition rule.

multiplication rule

if a certain thing is done with'M' different ways and a second thing has done in 'N' ways the total no of ways is m*n.

how many numbers can be formed using the digit 1,2,3,4,5,6,7 if repetition is allowed and if not allowed?

let us assume make a three-digit number.

if repetition is not allowed.

if repetition is not allowed.

addition rule is denoted by or/and.

                                            factorial

the factorial is denoted by [ ! ]

         module important questions exercise 5 (A)