First term = 2.6 x 1 = 2.6 Last term = 2.6 x 26 = 67.6 Required average = (2.6 + 67.6)/2 = 35.1
42, 48, 60, 84, 132, ?
160, 166, 178, 196, ?, 250
16 25 36 49 64 ?
12 18 31 51 ? 112
51 26 27 ? 86 217.5
24 36 72 108 216 ?
32, 48, 72, 108, ?, 243
226 231 466 ? 5606 28031
8 24 48 144 288 ?
18, 30, 46, 66, 90, ?
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