Question

4 bells ring at an interval of 7, 8 and 11 and 12 seconds respectively. All four bell rang
at 6 am, when the four bells will ring together next?​

Answer 1

Step-by-step explanation:

8=2×2×2

9=1×3×3

select d max count for 2,3,7 for 2. Its in 8 = 2×2×2.

for 3 . Its in 9 = 3×3

Then 7 only once in any combination

L.C.M= 2×2×2×3×3×7= 8×9×7

L.C.M = 504

So all the bells ring together after 504 seconds