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

LCM of 6, 7 and 8

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HCF of 6, 7, 8 and 9

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LCM of 6, 7, 8 and 9

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Solution

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

1. Find the HCF when the words greatest, largest, and maximum are used.

2. Find the LCM when the words least, smallest, and minimum are used.

Since we have to find the minimum time after which all the 4 bells toll together again, we take the LCM of 6, 7, 8 and 9.

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