Odd man out series - Quantitative Aptitude (MCQ) questions for Q. 70

Q.  Find the odd man out:

5, 8, 20, 42, 124, 246
- Published on 12 Jun 15

a. 20
b. 42
c. 124
d. 246

ANSWER: 20
 
The series is followed on the pattern of 2 alternate sequences with common formula being 2n-2 and 3n-2 respectively.

8 = 2*5-2

22 = 3*8-2

42 = 22*2-2

124 = 42*3-2

246 = 124*2-2

Hence, 20 is the odd no.

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