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Fundamental Principle of Counting

15 busses fly...

Question

15 busses fly between Hyderabad and Tirupathi.The number of ways can a man go to tirupathi from Hyderabad by a bus and return by a different bus is

A

15

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B

150

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C

210

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D

225

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Solution

The correct option is C 210
The number of ways in which a man travel from Hyderabad to Triupati is 15 and back to Hyderabad is 14 and hence the total number of ways =15 $\times$ 14 = 210

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