3, 10, 24, 52, 108, ?

Solution

Numbers of the form $$7\times(2)^n$$ are added, where $$n$$ is whole number.

3 $$+$$ $$(7\times2^0)$$ $$=$$ 10

10 $$+$$ $$(7\times2^1)$$ $$=$$ 24

24 $$+$$ $$(7\times2^2)$$ $$=$$ 52

52 $$+$$ $$(7\times2^3)$$ $$=$$ 108

108 $$+$$ $$(7\times2^4)$$ $$=$$ 220

=> Ans - (D)

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