Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Odd Man Out (Q.No. 8)
Directions to Solve
Find the odd man out.
8.
2, 5, 10, 17, 26, 37, 50, 64
Answer: Option
Explanation:
(1*1)+1 , (2*2)+1 , (3*3)+1 , (4*4)+1 , (5*5)+1 , (6*6)+1 , (7*7)+1 , (8*8)+1
But, 64 is out of pattern.
Discussion:
48 comments Page 2 of 5.
Phanendra said:
1 decade ago
64 is the only perfect square and rest are not.
And also we can easily subtract the 2 numbers and the difference should be ordered by 3, 5, 7, 9, 11, 13, 15, 17. Like that'but the number 64 is exempted from this case.
And also we can easily subtract the 2 numbers and the difference should be ordered by 3, 5, 7, 9, 11, 13, 15, 17. Like that'but the number 64 is exempted from this case.
Deepu said:
1 decade ago
The difference between the numbers are prime except between 50 and 64.
5-2=3.
10-5=5.
17-10=7.
26-17=9.
37-26=11.
50-37=13.
64-50=14.
3, 5, 7, 9, 11, 13 are prime numbers but 14 is not. So the answer is 64.
5-2=3.
10-5=5.
17-10=7.
26-17=9.
37-26=11.
50-37=13.
64-50=14.
3, 5, 7, 9, 11, 13 are prime numbers but 14 is not. So the answer is 64.
Devika said:
1 decade ago
I think Sonutalwani you are right but Deepu, Sahil, Rsh, Dipanshu, Teenu, Sourav and Nikita your explanations are not clear. Sania your formula is also right. Nishith, Vidhya and Vikram your also right.
Dipanshu said:
1 decade ago
Here series of odd no. is added in given no..
like
2+(3)=5
5+(5)=10
10+(7)=17
17+(9)=26
26+(11)=37
37+(13)=50
but 50+15=65
here is 64 so odd no. in this series is 64.....
answer is 64;
like
2+(3)=5
5+(5)=10
10+(7)=17
17+(9)=26
26+(11)=37
37+(13)=50
but 50+15=65
here is 64 so odd no. in this series is 64.....
answer is 64;
Subin said:
7 years ago
I got another solution.
It's an alternate even-odd series..
2=even,
5=odd,
10=even,
17=odd,
26=even,
37=odd,
50=even,
64=should've been an odd no. but its not.
So, 64 is the answer.
It's an alternate even-odd series..
2=even,
5=odd,
10=even,
17=odd,
26=even,
37=odd,
50=even,
64=should've been an odd no. but its not.
So, 64 is the answer.
(1)
Gajendra said:
1 decade ago
Difference b/w pair of digit like that 3, 5, 7, 9, 11, 13, 15.. Therefore last number should be 50+15 = 65.
5-2=3, 10-5=5, 17-10=7, 26-17=9, 37-26=11, 50-37=13, but 64-50=14.
5-2=3, 10-5=5, 17-10=7, 26-17=9, 37-26=11, 50-37=13, but 64-50=14.
Ankita sood said:
1 decade ago
general term :
tn = t(n-1) + 2n-1 where n = 2,3,4,5...
t= 2
t1= 2 + 2(2)-1 = 5
t2= 5 + 2(3)-1 = 10
t3= 10 + 2(4)-1 = 17.... and so on where 64 is out of pattern
tn = t(n-1) + 2n-1 where n = 2,3,4,5...
t= 2
t1= 2 + 2(2)-1 = 5
t2= 5 + 2(3)-1 = 10
t3= 10 + 2(4)-1 = 17.... and so on where 64 is out of pattern
Vikram said:
1 decade ago
Here we can easily subtract the 2 numbers and the difference should be ordered by 3, 5, 7, 9, 11, 13, 15, 17. Like that'but the number 64 is exempted from this case.
Rsh said:
1 decade ago
The difference between each of them is odd no that is
2+3=5
5+5=10
10+7=17
17+9=26
26+11=37
37+13=50
50+15=64
But there is no 65 and there is 64. So answer is 64.
2+3=5
5+5=10
10+7=17
17+9=26
26+11=37
37+13=50
50+15=64
But there is no 65 and there is 64. So answer is 64.
Sahil said:
1 decade ago
Another way of looking
2+3=5
5+5=10
10+7=17
17+9=26
26+11=37
37+13=50
50+15=65
64 is odd
i.e.. add next even number to the result staring from 3 we get 64 odd
2+3=5
5+5=10
10+7=17
17+9=26
26+11=37
37+13=50
50+15=65
64 is odd
i.e.. add next even number to the result staring from 3 we get 64 odd
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