Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Odd Man Out (Q.No. 2)
Directions to Solve
Find the odd man out.
2.
8, 27, 64, 100, 125, 216, 343
Answer: Option
Explanation:
The pattern is 23, 33, 43, 53, 63, 73. But, 100 is not a perfect cube.
Discussion:
28 comments Page 1 of 3.
Gayathri ram said:
1 decade ago
We can do this problem by another method also. See the sequence. If you remove 100 then you can see continuous even odd sequence.
8=even.
27=odd.
64=even.
125=odd.
216=even.
343=odd.
If you see that there will continuous even, odd sequence. Since 100 comes next to 64. Definitely it is an wrong no.
8=even.
27=odd.
64=even.
125=odd.
216=even.
343=odd.
If you see that there will continuous even, odd sequence. Since 100 comes next to 64. Definitely it is an wrong no.
(1)
Jincy said:
1 decade ago
Answer to the first series is 39.
Let the numbers be t(0), t(1), etc
To get the nth term : t(n) = t(n-1) + 1 + 2^(n-1)
3 = 1 + 1 + 2^0
11 = 6 + 1 + 2^2
20 = 11 + 1 + 2^3
next number will be 20 + 1 + 2^4 = 37
Let the numbers be t(0), t(1), etc
To get the nth term : t(n) = t(n-1) + 1 + 2^(n-1)
3 = 1 + 1 + 2^0
11 = 6 + 1 + 2^2
20 = 11 + 1 + 2^3
next number will be 20 + 1 + 2^4 = 37
Prashant kumar singh said:
1 decade ago
@Gayathri
You are right but this question also we can solve by another method like-
8=8
27=2+7=9
64=6+4=10
100=1+0+0=1
125=1+2+5=8
216=2+1+6=9
343=3+4+3=10
So wrong answer is 100.
You are right but this question also we can solve by another method like-
8=8
27=2+7=9
64=6+4=10
100=1+0+0=1
125=1+2+5=8
216=2+1+6=9
343=3+4+3=10
So wrong answer is 100.
B D Vekaria said:
1 decade ago
Thanks You made easy.
Let me ask questions to find wrong number
a) 1 3 6 11 20 39 70
b) 50 51 47 56 42 65 29
Formulae for sum of even numbers from 0 - 40 ?
Let me ask questions to find wrong number
a) 1 3 6 11 20 39 70
b) 50 51 47 56 42 65 29
Formulae for sum of even numbers from 0 - 40 ?
Aman soni said:
9 years ago
First of all we see the option in question is 27 100 125 343 in question said that find odd men out in option we see 27 125 343 these all are odd number then answer is 100.
Zainab Maratab said:
4 years ago
2^3 = 8 even
3^3 = 27 odd
4^3 = 64 even
5^3 = 125 odd
6^3 = 216 even
7^3 = 343 odd.
All are expected 100. So, the answer is 100b because it's no cube.
3^3 = 27 odd
4^3 = 64 even
5^3 = 125 odd
6^3 = 216 even
7^3 = 343 odd.
All are expected 100. So, the answer is 100b because it's no cube.
(7)
Poornima said:
1 decade ago
For the first one - I can even conclude that 343 is the answer because it is the only prime number. Why is that also not a valid answer?
Shameem khan said:
1 decade ago
8=8.
27=2+7=9.
64=6+4=10.
100=1+0+0=1.
125=1+2+5=8.
216=2+1+6=9.
343=3+4+3=10.
Answer = 100. Except 100 remaining all are in series.
27=2+7=9.
64=6+4=10.
100=1+0+0=1.
125=1+2+5=8.
216=2+1+6=9.
343=3+4+3=10.
Answer = 100. Except 100 remaining all are in series.
Sonali Thilak said:
8 years ago
@Poornima.
You are right. Why can't we consider 343 as an answer guys?
Because that is the only prime no given there, right?
You are right. Why can't we consider 343 as an answer guys?
Because that is the only prime no given there, right?
(2)
Praveena said:
11 months ago
Here, All the given numbers are perfect cubes but 100 is not the perfect cube of any number.
So, it will be the answer.
So, it will be the answer.
(2)
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