The phrase "a well-thought-out strategy" means that the decision was made after careful consideration. The other options imply less thoughtful or random decision-making.
8 24 12 ? 18 54
261 256 246 231 211 ?
...To find the Next number in the given series.
6 9 13 19 29 47 ?
...26 63 124 215 342 511 ?
...18 29 51 84 128 182
7 98 644 3145 12596 37797
...3, 49, 191, 477, ?, 1673
642 202 541 312 523 ?
...6, 17, 21, 47, ?, 107
5 4 29 24 185 ?
