The Insurance Regulatory and Development Authority

43           86           258         ?              5160                       30960

11           20           ?              64           112         192

30           162         344         ?              890         1270

What will come in place of (?) question mark in the given number series.

10, 17, 26, 37, 50, ?

What will come in place of the question mark (?) in the following series?

168, 120, ?, 48, 24, 8

64, 32, 48, 120, 420, ?

18.003 × 3.99 × (135.003 ÷ 26.97) – (15.001 × 3.94) = ?

52, 77, 127, ?, 302, 427

 6, 20, 63, 193, ?, 1758   

25           54           ?              228         460         924