Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. All the bells ring together after ............ seconds
516
504
508
512
A
504
B
516
C
508
D
512
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Solution
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The correct option is A 504 2|6,7,8,9––––––––– 3|3,7,4,9––––––––– |1,7,4,3––––––––– LCM=2×3×7×4×3=504.
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