Select the number that will come next in the following series.
3, 8, 18, 38, 78, ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 158.
Next term = Previous term × 2 + 2
3, 8, 18, 38, 78, ?
3 × 2 + 2 = 8
8 × 2 + 2 = 18
18 × 2 + 2 = 38
38 × 2 + 2 = 78
Similarly,
Next term = 78 × 2 + 2 = 158
Hence, the correct answer is 158.