Odd man out series - Quantitative Aptitude (MCQ) questions for Q. 112

Q.  Determine the odd man out:

15, 16, 34, 105, 424, 2124

- Published on 15 Jun 15

a. 105
b. 424
c. 34
d. 2124

ANSWER: 2124
 
The following pattern has been followed in this question:

16 = 15 x 1 + 1

34 = 16 x 2 + 2

We have established that previous number is multiplied by increasing numbers (1,2,3,4.....) and then added by increasing numbers (1,2,3,4...)

105 = 34 x 3 + 3

424 = 105 x 4 + 4

2125 = 424 x 5 + 5

=> 2124 is incorrect

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