Instructions

What should come in place of the question mark (?) in the following numbers series ?

Question 122

4 9 19 ? 79 159 319

Solution

In the bgiven series, the nth term is obtained as,
nth term = previous term + 5 * 2^(n-2)
Therefore, 4th term = 19 + 5 * 2^(2) =39
Hence, the correct option is option B.

 


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