Four bells ring at intervals of $6, 7, 8 a n d 9$ seconds respectively. All the bells ring together after ....... seconds

504

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516

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508

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512

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Solution

The correct option is B $504$
2|6,7,8,9
3|3,7,4,9
|1,7,4,3
$L C M = 2 \times 3 \times 7 \times 4 \times 3 = 504$ .

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