7, 6, 11, 32, 135, 634
a. 32
b. 11
c. 135
d. 634
e. 6
Sol:
7 * 1 – 1 = 6
6 * 2 – 1 = 11
11 * 3 – 1 = 32
32 * 4 – 1 = 127
127 * 5 – 1 = 634
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