3, 5, 12, 38, ?, 772
a) 142
b) 148
c) 154
d) 158
e) 160
Sol:
3 * 1 + 2 = 5
5 * 2 + 2 = 12
12 * 3 + 2 = 38
38 * 4 + 2 = 154
154 * 5 + 2 = 772
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