Aptitude - Odd Man Out and Series - Discussion
Discussion Forum : Odd Man Out and Series - Pick Wrong No. (Q.No. 5)
Directions to Solve
Find out the wrong number in the given sequence of numbers.
5.
1, 2, 6, 15, 31, 56, 91
Answer: Option
Explanation:
1, 1 + 12 = 2, 2 + 22 = 6, 6 + 32 = 15, 15 + 42 = 31, 31 + 52 = 56, 56 + 62 = 92
Last number of given series must be 92 not 91.
Discussion:
22 comments Page 2 of 3.
Debasish said:
1 decade ago
6-2 = 4 = 2*2.
15-6 = 9 = 3*3.
31-15 = 16 = 4*4.
56-31 = 25 = 5*5.
91-56 = 35! = 6*6.
15-6 = 9 = 3*3.
31-15 = 16 = 4*4.
56-31 = 25 = 5*5.
91-56 = 35! = 6*6.
Moni said:
1 decade ago
What is the answer for sum?
Harsh said:
1 decade ago
Only the sum of first and last number is divisible by 5.
Saran said:
1 decade ago
Answer is 91 but calculate answer is 92. So it is a wrong no.
Beda said:
1 decade ago
In question 31 is the only prime number. So why the answer is not 31?
Sam said:
1 decade ago
10 teams participating in national football league. If each team plays the other team two times, the total number of games the league will play is.
Umang said:
1 decade ago
2-1 = 1*1
6-2 = 2*2
15-6 = 3*3
31-15 = 4*4
64-31 = 5*5
But 91-56 = 6*6 is not happening.
So 91 is odd no.
6-2 = 2*2
15-6 = 3*3
31-15 = 4*4
64-31 = 5*5
But 91-56 = 6*6 is not happening.
So 91 is odd no.
Rajesh said:
1 decade ago
@Kumar.
Your concept is OK. But same time you took the wrong concept.
First minus 1 by 2.
Then minus 6 by 2 how is it correct? OK now you understand.
But your thing is good.
Your concept is OK. But same time you took the wrong concept.
First minus 1 by 2.
Then minus 6 by 2 how is it correct? OK now you understand.
But your thing is good.
Sikkanthar said:
1 decade ago
In this problem they are adding the result with square value of the natural numbers.
I mean.
1,
1(result) + (1*1) = 2.
2(result) + (2*2) = 6.
6(result) + (3*3) = 15.
15(result) + (4*4) = 31.
31(result) + (5*5) = 56.
56(result) + (6*6) = 92.
Now we are getting 92 not 91.. So 91 is the wrong number of the given.
I mean.
1,
1(result) + (1*1) = 2.
2(result) + (2*2) = 6.
6(result) + (3*3) = 15.
15(result) + (4*4) = 31.
31(result) + (5*5) = 56.
56(result) + (6*6) = 92.
Now we are getting 92 not 91.. So 91 is the wrong number of the given.
Sonutalwani said:
1 decade ago
1 + (1*1) = 2.
2 + (2*2) = 6.
6 + (3*3) = 15.
15 + (4*4) = 31.
31 + (5*5) = 56.
56 + (6*6) = 92 (91 is wrong number).
2 + (2*2) = 6.
6 + (3*3) = 15.
15 + (4*4) = 31.
31 + (5*5) = 56.
56 + (6*6) = 92 (91 is wrong number).
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