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3 × 1 + 5 = 8 8 × 2 + 10 = 26 26 × 3 + 15 = 93 93 × 4 + 20 = 392 392 × 5 + 25 = 1985 1985 × 6 + 30 = 11940
21, 28, 39, 52, ?, 88
80 81.5 83.5 ? 89 92.5
...31 32 35 ? 47 56
...5, 6, 14, 45, ?, 925
580 557 528 497 ? 419
289 169 121 ? 25 9
...9 19 39 ? 159 319
81 72 136 111 ? 278
...53 × 38 + 32 × ∛54872 = ?
What will come in place of the question mark (?) in the following series?
3.5, 9.5, 27.5, 81.5, 243.5, 729.5, ?
