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How many times does a clock strike in total when striking once at 1 o'clock, twice at 2 o'clock, and so on up to 12 o'clock?

0
A) 72
B) 66
C) 78
D) 84

Correct Answer: C) 78

• The clock strikes 1 + 2 + 3 + ... + 12 times. • Using the arithmetic-series formula n(n + 1)/2, the total is 12 × 13 ÷ 2. • The result is 78 strikes. • This assumes the question asks for one complete sequence from 1 o'clock through 12 o'clock.

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