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# Solved Examples(Set 6) - Series - Odd Man Out

 26. Find the odd man out. $5,10,40,81,320,640,2560$ A. $81$ B. $320$ C. $40$ D. $2560$

Explanation:

$5×2=10\\10×4=40\\40×2=80\\80×4=320\\320×2=640\\640×4=2560$

Hence, $80$ should have come in place of $81$

 27. Find the odd man out. $12,21,32,45,60,77,95$ A. $45$ B. $32$ C. $95$ D. $21$

Explanation:

$12+9=21\\21+11=32\\32+13=45\\45+15=60\\60+17=77\\77+19=96$

Hence, $96$ should have come in place of $95$

 28. Find the odd man out. $3,5,15,75,1120,84375$ A. $15$ B. $1120$ C. $84375$ D. $3$

Explanation:

Pattern:
first × second = third
second × third = fourth
...

That is,
$3×5=15\\5×15=75\\15×75=1125\\75×1125=84375$

Hence, $1125$ should have come in place of $1120$

 29. Find the odd man out. $3576,1784,888,440,216,105,48$ A. $888$ B. $1784$ C. $105$ D. $216$

Explanation:

$\dfrac{3576-8}{2}=1784\\\dfrac{1784-8}{2}=888\\\dfrac{888-8}{2}=440\\\dfrac{440-8}{2}=216\\\dfrac{216-8}{2}=104\\\dfrac{104-8}{2}=48$

Hence, $104$ should have come in place of $105$

 30. Find the odd man out. $30,-5,-45,-90,-145,-195,-255$ A. $-195$ B. $-5$ C. $-255$ D. $-145$

$30-35=-5\\-5-40=-45\\-45-45=-90\\-90-50=-140\\-140-55=-195\\-195-60=-255$
Hence, $-140$ should have come in place of $-145$