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Question
A clock strikes once at 1 o'clock, twice at 2 o'clock, thrice at 3 o'clock and so on. The number of times it strikes in 24 hours will be
A clock strikes once at 1 o'clock, twice at 2 o'clock, thrice at 3 o'clock and so on. The number of times it strikes in 24 hours will be
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Solution
The correct option is C 156
2[1+2+3..........+12]=2×12×132=156
2[1+2+3..........+12]=2×12×132=156
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