A clock strikes the number of times of the hour. How many strikes does it make in one day?

165

times

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156

times

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78

times

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87

times

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Solution

The correct option is B $156$ times
For the first 12 hours of the day,the clock will strike
$1 + 2 + 3 + . . . . . . + 12 = \frac{12}{2} (1 + 12) = 78$ times
For the next $12$ hours, there will be another 78 times, so in one day,the clock willl strike $156$ times

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A clock strikes the number of times of the hour. How many strikes does it make in one day?

The correct option is B 156 timesFor the first 12 hours of the day,the clock will strike1+2+3+......+12=122(1+12)=78 times For the next 12 hours, there will be another 78 times, so in one day,the clock willl strike 156 times

The correct option is B $156$ times
For the first 12 hours of the day,the clock will strike
$1 + 2 + 3 + . . . . . . + 12 = \frac{12}{2} (1 + 12) = 78$ times
For the next $12$ hours, there will be another 78 times, so in one day,the clock willl strike $156$ times