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BECE Mathematics 2014 Paper

Question : 10

Total: 40

Solution:

When their multiples are the same, they will ring simultaneously.

For the first time, that will be their least common multiples (L.C.M)

Multiples of

3=\{3,6,9,12,15,\ldots\}

Multiples of

4=\{4,8,12,16,\ldots\}

After 12 hours both bells will ring at the same time.

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