Four bells ring at intervals of 2 seconds, 3 seconds, 7 seconds and 9 – McqOptions

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1.	Four bells ring at intervals of 2 seconds, 3 seconds, 7 seconds and 9 seconds respectively. After playing together once, after how long will they play together again?
A.	1 मिनट 6 सेकण्ड
B.	2 मिनट 6 सेकण्ड
C.	72 सेकण्ड
D.	3 मिनट
Answer» C. 72 सेकण्ड

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