Aptitude - Odd Man Out and Series - Discussion

Discussion Forum : Odd Man Out and Series - Odd Man Out (Q.No. 13)
Directions to Solve
Find the odd man out.

13.
41, 43, 47, 53, 61, 71, 73, 81
61
71
73
81
Explanation:
Each of the numbers except 81 is a prime number.
Discussion:
59 comments Page 1 of 6.

SUBASH said:   8 months ago
It's also in the order added by even numbers starting from 2, 4, 6, 8, 10, 12, 14.

So instead of 81, it should be 85.

Hence, 81 is the odd one out.
(8)

Sunshine JV said:   1 year ago
For anyone saying even 73 can be the answer, no it can't
if the series were;

41,43,47,53,61,71,73,97 the answer would have been 73.
but the series is:
41,43,47,53,61,71,73,81.

The last number 81 doesn't go with the 2,4,6,8,10,12,14.
So the answer is 81, with the explanation that 81 is a composite number.
(6)

Venkat said:   1 year ago
I think 73 is the answer.
(8)

Akshay kamble said:   2 years ago
Yes, you are right, agree with you @Praveen.
(1)

Shree said:   3 years ago
43, 47, 53, 61, 71, 73 all are prime numbers but only 81 non-prime.

So the answer is 81.

Keerthikumari o c said:   3 years ago
Yes, 73 is the right answer.
(3)

Sakthi Thiyagu said:   4 years ago
Read the answer properly, it say that except 81 all are prime number. To all genius.
(1)

Abhi said:   4 years ago
81 is the only one which is divisible by 3.

Arjun Tejaswi.S said:   5 years ago
It can be solved in this way too.

41+(1*1)+1 = 43
43+(2*1)+2 = 47
47+(3*1)+3 = 53
53+(4*1)+4 = 61
61+(5*1)+5 = 71
71+(6*1)+6 = 83.

And here 81. So, therefore, it is out of the series.
(2)

Kiran dudi said:   5 years ago
Why not 73?
(1)