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 numberof ways in which a man travelo from hyd to triu is 15 and back to hyd is 14 and hence total number of ways =15 × 14 = 210