Question 22

Which number will replace the question mark (?) in the following series?
5, 8, 20, 34, 76, 142, ?

Solution

$$5\times\ 2-2=8$$

$$8\times\ 2+4=20$$

$$20\times\ 2-6=34$$

$$34\times\ 2+8=76$$

$$76\times\ 2-10=142$$

$$142\times\ 2+12=296$$

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