Find the number that can replace question mark (?) in the series given below. 20, 62, 189, 571, 1718, ?
5160
Each term is obtained by multiplying the previous term by 3 and adding an increasing value: 20x3+2=62, 62x3+3=189, 189x3+4=571, 571x3+5=1718. Following the same rule, 1718x3+6=5160, which is the required number.
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