Which of the following schedule concerns about “unfair

Identify the logic of the below given series and given answer.

Series I :: 81, 89, 116, 241, (A), 1915

18           434         642         746         798         ?

10, 22, 46, ?, 130, 190

12, 20, 36, ?, 132, 260

8    20    36     56     80    ?

If  152,      242,       x ,    332,     404,       314,

then find the value of (2x – 1)?

21, 22, 48, 153, 628, ?

30         15         15            30           120           ?

48      61       76       94     116       ?

If 4 2 x 1.5 0.5

Then, 1/3 x + 2.5 = ?