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.
Manish said:
9 years ago
If we see prime numbers. Then 31 will be the answer. So which is the correct answer?
Fathima said:
9 years ago
31 is the only prime number.
Why not the answer is 31? Some one explain.
Why not the answer is 31? Some one explain.
Beda said:
1 decade ago
In question 31 is the only prime number. So why the answer is not 31?
Rajeswari Yarra said:
2 years ago
Easy to Understand. Thanks everyone for explaining the answer.
(1)
Aditya said:
9 years ago
2, 5, 15, 131, 530, 13257 find out wrong number of the series.
Saran said:
1 decade ago
Answer is 91 but calculate answer is 92. So it is a wrong no.
Harsh said:
1 decade ago
Only the sum of first and last number is divisible by 5.
Sreeram said:
10 years ago
Why not 31? It's the only prime number.
Dhivya said:
1 decade ago
Can someone explain this clearly ?
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