नाकों चने

4 12 ? 144 544 2112

32, ?, 41, 68, 132, 257

1      2       11       36        85        ?

If 6 4 x 5.75 9,

Then, (x²-1) = ?

1335       737         355         141         47           ?

133       183       220       ?       263         273

Three series I, II and III, are given below, which contain a missing term 'P', 'Q' and 'R' respectively.

Series I: 12, 13, 17, 44, P, 3425

5184, ?, 432, 144, 36, 12

Each question below is based on a number series. Identify the pattern and answer accordingly.