4 bells in a church toll at intervals of 6, 7, 8 and 9 seconds, respectively. To find out the time after which they will toll together again, we take

HCF of 6, 7, 8 and 9

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LCM of 6, 7, 8 and 9

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HCF of 6, 7 and 9

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LCM of 6, 7 and 8

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Solution

The correct option is B LCM of 6, 7, 8 and 9

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