Find the missing term: 3, 10, 29, 66, 127, ?

Answer: Option D

The given series is a triangular pattern series.
So, we have
3       10       29       66       127       ?
     7       19       37       61
         12        18      24
              6           6
So, missing term
= 127 + (61 + 24 + 6)
= 127 + 91
= 218