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What will come in place of the question mark (?) in each of the following number series ?
The pattern is :
8 + 9 = 17
17 + 13(= 9+4) = 30
30 + 17(= 13+4) = 47
47 + 21(= 17+4) = 68
68 + 25(= 21+4) = 93
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