RRB Junior Engineer Stage 1 Model Papers 4

Question : 45 of 99

Marks: +1, -0

1, 3, 7, 15, 31, ?

Solution:

1 + 1 × 2 = 3

3 + 2 × 2 = 7

7 + 4 × 2 = 15

15 + 8 × 2 = 31

31 + 16 × 2 = 63

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