Question 20

4, __ , 19, 39, 79, 159

Solution

The pattern followed is that number of the form $$(5\times2^n)$$ is added where $$n$$ is whole number.

4 $$+$$ $$(5\times2^0)=$$ 9

9 $$+$$ $$(5\times2^1)=$$ 19

19 $$+$$ $$(5\times2^2)=$$ 39

39 $$+$$ $$(5\times2^3)=$$ 79

79 $$+$$ $$(5\times2^4)=$$ 159

=> Ans - (D)

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