Free Set
Question
Complete series: 4, 9, 19, 39, ?
Options
A79 Correct Answer
B89
C59
D69
Correct Answer & Explanation
Option A: 79
Rationale
Pattern: x2+1. 4x2+1=9, 9x2+1=19, 19x2+1=39, 39x2+1=79. So next is 79. This is common reasoning series pattern.
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