Question
A city has 12 gates. In how many ways can a person enter the city through one gate and come out through a different gate?

125

165

132

None of these
easy
Solution
132
Since, there are 12 ways to enter into the city. After entering into the city, the man can come out through a different gate in 11 ways.
Hence, by the fundamental principle of counting.
Total number of ways is 12 × 11 = 132 ways.
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