Number Series

What will come to replace '?'

2, 7, 27, 107, 427, ?

1) 1262                  2) 1707                     3) 4027                          4) 5163

Answer::Option  2

The pattern is + 5, + 20, + 80, + 320, ...... i.e. + (5 x 1²), + (5 x 2²), + (5 x 4²), + (5 x 8²),.....

So, missing term = 427 + (5 x 16²) = 427 + 1280 = 1707.