SSC CHSL 29 JAN 2017 SHIFT 3 TIER 1 REASONING QUESTION 7

7.Select the odd word/letters/number/number pair from the given alternatives.
Options:
1) 583
2) 275
3) 286
4) 427
Answer: 4

First Digit + Last Digit = Middle Digit
583 -> 5 + 3 = 8

275 -> 2 + 5 = 7

286 -> 2 + 6 = 8

427 -> 4 +  7 != 2

Odd number will be 427