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Three numbers a,b,c are in proportion iff $$b^2 = ac$$
Here, a = 24 and b = 36
=> $$(36)^2 = 24 \times c$$
=> $$c = \frac{36 \times 36}{24} = 3 \times 18$$
=> $$c = 54$$
=> Ans - (B)
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