66   70    97    ?       238    274
...18   22    49    ?       190    226
...44 23 21 34.5 ? 167.5
...7200 7200 3600 1200 300 ?
...10                          15                          ?                    Â...
3, 4, 10, 33, 136, ?, 4116
Choose the correct alternative
21: 3 ∷ 574: ?
18    40     84    172     ?     700
...21, 37, 62, 98, 147, ?
32, 8, 4, ?, 3, 3.75