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1. What will come at the place of question mark ?
9, 17, 33, 65, ?

Solution:

First term → 9

Second term → (9 *2 -1) = 17

Third term → (17 *2 -1) = 33

Fourth term → (33 *2 -1) = 65

Fifth term → (65 *2 -1) = 129
 

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