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Solved Examples(Set 5) - Series - Odd Man Out

21. Find the odd man out. $3,8,18,38,78,158,316$
A. $38$B. $158$
C. $8$D. $316$
Discuss
answer with explanation

Answer: Option D

Explanation:

$3×2+2=8\\8×2+2=18\\18×2+2=38\\38×2+2=78\\78×2+2=158\\158×2+2=318$

Therefore, $318$ should have come in place of $316$

22. Find the odd man out. $5,6,14,45,185,925,5556$
A. $925$B. $6$
C. $5556$D. $185$
Discuss
answer with explanation

Answer: Option D

Explanation:

$5×1+1=6$
$6×2+2=14$
$14×3+3=45$
$45×4+4=184$
$184×5+5=925$
$925×6+6=5556$

Therefore, $184$ should have come instead of $185$

23. Find the odd man out. $23,27,36,52,77,111,162$
A. $111$B. $27$
C. $52$D. $162$
Discuss
answer with explanation

Answer: Option A

Explanation:

$23+2^2=27\\27+3^2=36\\36+4^2=52\\52+5^2=77\\77+6^2=113\\113+7^2=162$

Hence, $113$ should have come in place of $111$

24. Find the odd man out. $241,263,248,271,255,277,262$
A. $263$B. $241$
C. $277$D. $271$
Discuss
answer with explanation

Answer: Option D

Explanation:

$241+22=263\\263-15=248\\248+22=270\\270-15=255\\255+22=277\\277-15=262$

Therefore, $270$ should have come in place of $271$

25. Find the odd man out. $125,127,130,135,142,153,165$
A. $165$B. $142$
C. $153$D. $130$
Discuss
answer with explanation

Answer: Option A

Explanation:

Prime numbers $2,3,5,7,11,13$ are added successively. Hence, $165$ is wrong.

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