23, 21, ?, 118, 470, 2348
A.20
B.30
C.40
D.70
E.90
Sol:
23 * 1 – 2 = 21
21 * 2 – 2 = 40
40 * 3 – 2 = 118
118 * 4 – 2 = 470
470 * 5 – 2 = 2348
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