If a clock strikes appropriate number of times at each hour,

If a clock strikes appropriate number of times at each hour, how many times will it strike a day ?

As we know that ,

∵ Sum of first n natural no.s =	n(n + 1)
	2

Here , n = 12
Required answer = 2 (1 + 2 + 3 + ..... + 12)

Required answer = 2 ×	12 ×13	= 156
	2