Extension education was first time started in which country?
Extension education was used and extension activity was started first time in USA.
Select the number from among the given options that can replace the question mark (?) in the following series.
8, 27, 64, 125, 216, ?
8, 7, 12, 35, 128, 635
7 29 ? 129 211 349
1 1 8 4 27 9 ?
...5 14 56 220 1125 6786
...40 30 20 ? 7.5 4.375
219 365 511 ? 803 949
...1930 1805 1589 1246 734 ?
...1001, 728, 513, 342, 217, ?
36, 49, 23, 62, ?, 75
