3, 12, 40, ?, 381, 1150
a) 120
b) 80
c) 90
d) 125
e) 132
Sol:
3 * 3 + 3 = 12
12 * 3 + 4 = 40
40 * 3 + 5 = 125
125 * 3 + 6 = 381
381 * 3 + 7 = 1150
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