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If the 4th, 7th and 10th terms of a GP a...

If the 4th, 7th and 10th terms of a GP are a, b and c respectively, then the reason between a, b and c is
A. `b = (a + c)/2`
B. `a^2 = bc`
C. `b^2 = ac`
D. `c^2 = ab`

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