Which number would replace the question mark in the given series?
9, 31, 97, 295, ?, 2671

Let us determine the operational pattern of the series:
* $9\times 3+4=31$
* $31\times 3+4=97$
* $97\times 3+4=295$

Following the same sequence ($\text{Previous term}\times 3+4$):

$$\text{Missing term}=295\times 3+4=885+4=889$$

Verifying for the next term:

$$889\times 3+4=2667+4=2671$$

The pattern is completely accurate.