A clock strikes once at 1 o'clock, twice at 2 o'clock, thrice at 3 o'clock, and so on. How many times will it strike in 24 hours?

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A 78 times
B 156 times
C 200 times
D 300 times

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Answer: B. 156 times

Answer: B) 156 times
Explanation: In 12 hours the clock strikes 1 + 2 + 3 + ... + 12 = 78 times. In 24 hours it strikes 2 × 78 = 156 times.

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A clock strikes once at 1 o'clock, twice at 2 o'clock, thrice at 3 o'clock, and so on. How many times will it strike in 24 hours?

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