In the following question, which one of the given responses would be a meaningful order of the following words in ascending order ?
A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
? , 9, 19, 39, 79
Answer : Option C
Explanation : 4 × 2 + 1 = 9
9 × 2 + 1 = 19
19 × 2 + 1 = 39
39 × 2 + 1 = 79
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