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Question

If 1176=2a×3b×7c, find the values of a, b and c. Hence, compute the value of 2a×3b×7-c as a fraction.

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Solution

First find the prime factorisation of 1176.
21176258822943147749771
It can be observed that 1176 can be written as 23×31×72.
1176=2a3b7c=233172
So, a = 3, b = 1 and c = 2.
Therefore, the value of 2a×3b×7-c is 23×31×7-2=8×3×149=2449

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