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 3 of 4.
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.
Tarun said:
1 decade ago
Two series both are divided by 2 in order to get the next term...
36/2=18
18/2=9
9/2=4.5
.....
and
54/2=27
27/2=13.5
13.5/2=6.75
....
36/2=18
18/2=9
9/2=4.5
.....
and
54/2=27
27/2=13.5
13.5/2=6.75
....
Subha said:
1 decade ago
36/2=18
54/2=27
18/2=9
27/2=13.5
9/2=4.5
so 18.5 is wrong
54/2=27
18/2=9
27/2=13.5
9/2=4.5
so 18.5 is wrong
Akansh said:
1 decade ago
Just divide all term by 9 except 18.5 all will be divided ;).
Guru Prakash.C said:
1 decade ago
The difference of first two is the third number
Farhat said:
1 decade ago
Nice question.
Kiran said:
1 decade ago
Pick alternate numbers
4.5*2=9
9*2=18
18*2=36
In the same way 18.5 is not the begining one for 2nd series. so ans 18.5.
4.5*2=9
9*2=18
18*2=36
In the same way 18.5 is not the begining one for 2nd series. so ans 18.5.
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
36+18=54
18+9=27
9+4.5=13.5
by this we can say 18.5 is wrong
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..
Ashik Mohammed Nazar said:
1 decade ago
All the others except 18.5 are divisible by 4.5
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