Complete the series.
4, 5, 8, 15, 30, (…)

Correct option is C

Let's analyze the pattern in the series:
The given series is: 4, 5, 8, 15, 30, (…)
From 4 to 5: +1
From 5 to 8: +3
From 8 to 15: +7
From 15 to 30: +15
The differences between consecutive terms are: +1, +3, +7, +15, which follow the pattern of doubling the previous difference and then adding 1.
Thus, the next difference should be:
15×2+1=31
Therefore,
30+31=61