6 2 8 ? 84 416
...Find the 31st term of the series 25, 29, 33……
12 23 65 ? 1239 7409
...24 25 46 ? 572 2885
...Find the maximum number of trees which can be planted, 25 meters apart, on the two sides of a straight road 2125 meters long
1331 1000 729 512 ? 216
...17 ? 2142 12852 64260 257040
...14 20 35 ? 433 2167
...1 5 13 25 41 ...
12 11 21 62 ? 1234