41. A clock strikes once at 1 o'clock, twice at 2 o'clock, thrice at 3 o'clock and so on. What is the total number of strikings in a day = ? A. 136 B. 146 C. 156 D. 166 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C Solution: Total number of strikings $$\eqalign{ & = 2\left( {1 + 2 + 3 + ..... + 12} \right) \cr & = 2 \times \frac{{12 \times 13}}{2} \cr & = 156 \cr} $$
