Based on the logic followed by the given set of numbers which of the following is different from the rest?
(3, 11, 31)
Answer
Correct Answer : d ) (8, 66, 518)
Explanation :According to the question
(3, 11, 31)
The common logic applied here is.
32+2=11
33+4=31
Considering Option (a)
(5, 27, 129)
52+2=27
53+4=129
Considering Option (b)
(7, 51, 347)
72 + 2 = 51
73 + 4 = 347
Considering Option (c)
(4, 18, 68)
42 + 2 = 18
43 + 4 = 68
Considering Option (d) 
(8, 66, 518)
82 + 2 = 66
83 + 4 = 516
Option (d) does not follow the same pattern.
Hence, (d) is the correct answer.
Such type of question is asked in various government exams like SSC CGL, SSC MTS, SSC CPO, SSC CHSL, RRB JE, RRB NTPC, RRB GROUP D etc.
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