Instructions

What should come in place of the question mark (?) in the following number series ?

Question 100

7, 15, 32, 67, ?

The series given above follows the pattern given

15 = 2*7 + 1
32 = 15*2 + 2
67 = 32*2 + 3
138 = 67*2 + 4

Hence, the required answer is 138

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