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WBCS Preliminary Examination 2016 — General Studies · Question 153 of 200

Q153
ArithmeticNumber System, LCM/HCF & Divisibility
A clock strikes once at 1 o'clock, twice at 2 o'clock, …, twelve times at 12 o'clock. How many times will the bell strike in the course of 2 days?
  1. a.78
  2. b.264
  3. c.312
  4. d.144

Answer: (C) 312

Total strikes in 12 hours = $1+2+3+...+12 = \frac{12 \times 13}{2} = 78$. In 24 hours = $78 \times 2 = 156$. In 2 days = $156 \times 2 = 312$.

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A clock strikes once at 1 o'clock, twice at 2 o'clock, …, twelve ti… — WBCS Preliminary Examination 2016 Q153 | Prostuti360°