Discussion :: Odd Man Out and Series
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In the following number series, a wrong number is given. Find out that number
8, 18, 40, 86, 178, 370, 752.
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Answer : Option B
Explanation :
The given sequence is
x 2 + 2 i.e. 8 x 2 + 2 = 16+2 = 18,
x 2 + 4 i.e. 18 x 2+ 4 = 36+4 = 40,
x 2 + 6 i.e. 40 x 2 + 6 = 80+6 = 86,
x 2 + 8 i.e. 86 x 2 + 8 = 172+8 = 180,
x 2 + 10 i.e. 180 x 2 + 10 = 360+10 = 370,
x 2 + 12 i.e. 370 x 2 + 12 = 740+12 = 752.
Hence, the number 178 is wrong, and it should be replaced by 180.
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