Identify the segment in the sentence, which contains the

12, 23, 68, 271, 1354, ?

15 25 40 65 ? 195

13           182         303         384         433         ?

27      44       63       86      ?        146

If  5,    6,   4,    39,     x,    585,

then, find the value of ((x/2) + 1 + 2x)?

Select the number from among the given options that can replace the question mark (?) in the following series.

2, 6, 12, 20, ?, ?

342      252      172      102      42      ?

7       14       42       168        840        ?