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A clock buzzes 1 time at 1 O'clock, 2 time at 2 O'clock, 3 times at 3 O'clock and so on. What will be the total number of buzzes in a day?

Correct Answer: 156

Explanation:

Number of buzzes in a day
       = 12(12 + 1)/2 x 2 = 156


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