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The error is in the verb "knew," which should be "know" because "did" requires the base form of the verb.
23 40 67 104 ? 208
...18, 54, 162, ?, 1458, 4374
350 35 7 ? 0.84 0.42
What will come in place of the question mark (?) in the following series?
2.5, 6.5, 18.5, 54.5, 162.5, 486.5, ?
8 13 36 123 ? 2585
152 142 122 ? 52 2
5 6 15 40 89 170 ?
...11 16 42 141 ? 2945 17700
...660, 653, 639, 618, 590, ?
380, ?, 360, 324, 260, 160
