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Aptitude - Odd Man Out and Series - Discussion

Discussion Forum : Odd Man Out and Series - Pick Wrong No. (Q.No. 13)
Odd Man Out and Series
Directions to Solve
Find out the wrong number in the given sequence of numbers.
13.
36, 54, 18, 27, 9, 18.5, 4.5
4.5
18.5
54
18
Answer: Option
Explanation:
The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it.
Discussion:
37 comments Page 1 of 4.
Karthik said:   2 decades ago
The given terms are exactly divisible by 3 except 18.5
Hence the answer is 18.5
Hrushikesh said:   2 decades ago
The given terms are divisible by 3 and 9 except 18.5
Udayakumar said:   1 decade ago
The diff b/w 54&36 is 18.the next no is 18. 27&18 is 9.the next no is 9. so in place of 18.5 if 13.5 comes then the diff is 4.5 which is the next no. so 18.5 is the wrong no
Kamaljeet said:   1 decade ago
Great work udaya.
Riby said:   1 decade ago
This is a truly fantastic explanation udayakumar.
Mathan said:   1 decade ago
The digits are in the odd places from the right corner is multiplied by 2.as it in the even places the 6th place no should be 13.5(18.5) when multiplied by 2 is 27.
Pranesh said:   1 decade ago
Alternative number is divisible by 2.
Ashik Mohammed Nazar said:   1 decade ago
All the others except 18.5 are divisible by 4.5
Nagendramurthy said:   1 decade ago
For this we have 3 to 4 alternative ways

1st all divisible 9 except 18.5
2nd all divisible 4.5 except 18.5
3rd sum of no is 9 ..

that is
54 (5+4=9)
36 (3+6=9)
27 (2+7=9)
4.5 also (4+5=9)
except 18.5 (1+8+5=14)

4th method is what udayakumar told.. great work udayakumar..
Sravya said:   1 decade ago
Simply we can say that

36+18=54
18+9=27
9+4.5=13.5
by this we can say 18.5 is wrong
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