SOLUTION: How many strokes do an ordinary clock strikes in a day if it strikes the number of hour every hour?

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Question 961664: How many strokes do an ordinary clock strikes in a day if it strikes the number of hour every hour?
Answer by Alan3354(69443) About Me  (Show Source):
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How many strokes do an ordinary clock strikes in a day if it strikes the number of hour every hour?
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1 + 2 + 3 ... + 12 = ((1 +12)/2)*12 = 78
78*2 = 156 per day