math
posted by ivan
hello I am new here my friend recommended me this website.
here is my question:
if a clock chimes the number of the hour every hour, how many times will it chime in a day?

Steve
it goes through the sequence of chimes from 112 twice during the day.
The sum of all the numbers from 1 to n is n(n+1)/2
So, the clock chimes
2 * (12*13)/2 = 156 times
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