3, 8, 18, 46, 100, 210, 432 · ABC26GN5530
Subject: General Aptitude · Chapter: Odd Man Out and Series
3, 8, 18, 46, 100, 210, 432
(a)8
(b)18
(c)46
(d)100
(e)210
Answer
Explanation
2nd term = (1st term × 2 + 2) = 3 × 2 + 2 = 8; 3rd term = (2nd term × 2 + 4) = 8 × 2 + 4 = 20; 4th term = (3rd term × 2 + 6) = 20 × 2 + 6 = 46; 5th term = (4th term × 2 + 8) = 46 × 2 + 8 = 100 and so on. 18 is wrong.
Explanation as extracted from the printed page; notation may be imperfect.
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