Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Pick Wrong No. (Q.No. 13)
Directions to Solve
Find out the wrong number in the given sequence of numbers.
13.
36, 54, 18, 27, 9, 18.5, 4.5
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.
Roniee said:
1 decade ago
I read it as whatever was being added to it, the double of it was deducted from it so according to me 18 added 36 deducted 9 added 18 deducted therefore when 9.5 was added 19 should have been deducted & 4.5 would be wrong & -0.5 could be the answer instead of 4.5 & I conclude that I considered 4.5 wrong!
Mandal said:
6 years ago
The simplest way is for all the numbers the sum of all the digits is 9 (36 is 3+6=9, 54 is 5+4=9, 27 is 2+7=9, 9 is 9, 4.5 is 4+5=9).
But for 18.5 its 1+8+5=14 and thus not equal to 9.
I am not sure if its a correct solution or not but this is the way that I could think of.
But for 18.5 its 1+8+5=14 and thus not equal to 9.
I am not sure if its a correct solution or not but this is the way that I could think of.
(1)
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..
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..
Anjali Mittal said:
8 years ago
1 and 2 number is the multiple of 3rd number and so on, but 18. 5 doesn't satisfy this condition i.e (18, 18*2=36, 18*3=54) (9, 9*2=18, 9*3=27) (4.5, 4.5*2=9, 4. 5*3=13.5). There should be 13.5 instead of 18.5.
(1)
Turubilli Hema lata said:
4 years ago
Solution:
36-->3+6 = 9
54-->5+4 = 9
18-->1+8 = 9
27-->2+7 = 9
9 will write as 09-->0+9 = 9
18.5--->1+8+5 = 14
4.5-->4+5 = 9.
All are divisible by 3 except 18.5 so answer is 18.5(B).
36-->3+6 = 9
54-->5+4 = 9
18-->1+8 = 9
27-->2+7 = 9
9 will write as 09-->0+9 = 9
18.5--->1+8+5 = 14
4.5-->4+5 = 9.
All are divisible by 3 except 18.5 so answer is 18.5(B).
(33)
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
Abi said:
4 years ago
No @Udhaya.
54 - 36 = 18,
27 - 18 = 9.
18.5 - 9 is not equal to 4.5.
So he said 18.5 is wrong.
My opinion is why we change 18.5, we also change 9..So 9 is also wrong.
54 - 36 = 18,
27 - 18 = 9.
18.5 - 9 is not equal to 4.5.
So he said 18.5 is wrong.
My opinion is why we change 18.5, we also change 9..So 9 is also wrong.
(2)
Harsh said:
7 years ago
Numbers are 36, 54, 18, 27, 9, 18.5, 4.5.
4.5+4.5=9,
18.5+18.5=37,
9+9=18,
27+27=54,
18+18=36,
Here, only the addition of 18.5 is not obtained. So, the answer is B.
4.5+4.5=9,
18.5+18.5=37,
9+9=18,
27+27=54,
18+18=36,
Here, only the addition of 18.5 is not obtained. So, the answer is B.
(2)
Vinoth said:
1 decade ago
Take the odd series first.
36/2 = 18.
18/2 = 9.
9/2 = 4.5.
Take the even series.
54/2 = 27.
27/2 = 13.5 but here 18.5.
So 18.5 is the wrong number in the series.
36/2 = 18.
18/2 = 9.
9/2 = 4.5.
Take the even series.
54/2 = 27.
27/2 = 13.5 but here 18.5.
So 18.5 is the wrong number in the series.
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.
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