Twelve > Permutation and Combination
A football stadium has four entrance gates and nine exits. In how many different ways can a man enter and leave the stadium?
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Atith Adhikari
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2 years ago
Solution
A man can enter the stadium from any one of the four entrance gates (m = 4) and can leave the stadium from any one of the nine exit gates (n = 9).
By the basic principle of counting, a man can enter and leave the stadium in $\rm m \times n = 4x9 = 36$ different ways.
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