5, 8, 20, 42, 124, 246, 736 · ABC26GN5533
Subject: General Aptitude · Chapter: Odd Man Out and Series
5, 8, 20, 42, 124, 246, 736
(a)8
(b)20
(c)42
(d)124
(e)246
Answer
Explanation
2nd term = (1st term × 2 – 2) = (5 × 2 – 2) = 8; 3rd term = (2nd term × 3 – 2) = (8 × 3 – 2) = 22; 4th term = (3rd term × 2 – 2) = (22 × 2 – 2) = 42; 5th term = (4th term × 3 – 2) = (42 × 3 – 2) = 124 and so on. 20 is wrong.
Explanation as extracted from the printed page; notation may be imperfect.
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