A clock gives one ring to respect 1o'clock, two rings to 2 o'clock and so on.If so, how many times it rings in 24 hours?

A)24

B)300

C)156

D)166

The clock strikes once at 1 o'clock,twice at 2 o'clock and so on.

[1 day = 24 hours] clock has 12 hours so we have to multiply the series by 2 to make it 24 hours.

 

2 [1 + 2 + 3 + ............ + 12]

 

Sn=n /2 [ a + L ]

Here, a = 1, n = 12, L = 12

 

S12 = 2 x (n/2) [a+L]

S12= 2 x (12/2) [1+12]

S12 = 12 × 13

S12 = 156

 

Hence, the clock will strike 156 times in a day.

 

 

The answer os the question would be © 156 times

The clock strikes once at 1o’ clock, twice at 2o’ clock and so on. 

So, the number of times the clock will strike in 12 hrs will be:

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 = 78 times.

Since the question is asked for 24 hrs you have to multiply this sum by 2 as it continues again from 1 to 12.

Hence the answer would be 78*2 = 156 times.

Dear student

The clock strikes once at 1 o'clock,twice at 2 o'clock and so on. [1 day = 24 hours] clock has 12 hours so we have to multiply the series by 2 to make it 24 hours. Hence, the clock will strike 156 times in a day