Question : Directions: Which number will replace the question mark (?) in the following series?
17, 37, 77, 157, 317, ?
Option 1: 637
Option 2: 683
Option 3: 649
Option 4: 634
Correct Answer: 637
Solution :
Given:
17, 37, 77, 157, 317, ?
The pattern is as follows –
17 + 20 = 37
37 + (20 × 2) = 37 + 40 = 77
77 + (40 × 2) = 77 + 80 = 157
157 + (80 × 2) = 157 + 160 = 317
317 + (160 × 2) = 317 + 320 = 637
So, 637 is the missing number of the series. Hence, the first option is correct.
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