Question

A clock strikes once at one o'clock, twice at two o'clock, thrice at three o'clock, and so on. How many times, in total, will it strike in 24 hours?

• A. 144
• B. 288
• C. 300
• D. 156
• E. 72

Answer 1

Answer: (D)

156

Clock strikes the same number of times as the hour that it is in, i.e, once at 1.
The hours on the clock range from 1 to 12.
In a span of 24 hours, it will complete the cycle twice.
number of times it strikes=2(1+2+...12)
=156