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
Answer: Option
Explanation:
Each of the numbers except 81 is a prime number.
Discussion:
62 comments Page 5 of 7.
Sandeep said:
1 decade ago
I didn't understand
when n=1
then t1=41(1-1)+2(1)
=41(0)+2
=0+2
then t1=2
then how come t1=43?
Please explain .
when n=1
then t1=41(1-1)+2(1)
=41(0)+2
=0+2
then t1=2
then how come t1=43?
Please explain .
Aran said:
1 decade ago
It will definitely 73.
Sunitha said:
1 decade ago
Thank you ankita.
Shantanu said:
1 decade ago
Hey people it should be 73 also..... because in each case 2 is getting added and in that case 73 doesn't fit!!
Saurabh said:
1 decade ago
What is prime no?
Yogesh Rai said:
1 decade ago
4*10+1, 7*6+1, 6*8-1, 6*9-1, 6*10+1, 7*10+1, 8*9+1,
but there are 9*9= 81
but there are 9*9= 81
Praveen said:
1 decade ago
I am not agree with Vikash and ankita as according to them 73 and 81 both will be the answer.But we have to choose one answer.So correct answer is 81 which is not a prime number
Ankita sood said:
2 decades ago
General term is
tn=t(n-1)+2n ,where n is 1,2,3..
t = 41
t1= 41+2(1) = 43
t2= 43+2(2) = 47
t3= 47+2(3) = 53... and so on where 81 doesn't fit into the series.
tn=t(n-1)+2n ,where n is 1,2,3..
t = 41
t1= 41+2(1) = 43
t2= 43+2(2) = 47
t3= 47+2(3) = 53... and so on where 81 doesn't fit into the series.
Raju said:
1 decade ago
Hey how you express above formula in to the sum. tn=t (n-1) +2n.
For example =41 (1-1) +2*1=2.
For example =41 (1-1) +2*1=2.
Paresh said:
1 decade ago
41+2=43.
43+4=47.
47+6=53.
53+8=61.
61+10=71.
71+2=73.
73+4=77.
But there is 83, which was not in same sequence. There must be 77.
43+4=47.
47+6=53.
53+8=61.
61+10=71.
71+2=73.
73+4=77.
But there is 83, which was not in same sequence. There must be 77.
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