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.
Saran said:
1 decade ago
Answer is 91 but calculate answer is 92. So it is a wrong no.
Riya said:
1 decade ago
According to me 31 should be the answer because its the only prime no in the question?
Moni said:
1 decade ago
What is the answer for sum?
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.
Sreeram said:
10 years ago
Why not 31? It's the only prime number.
Manish said:
9 years ago
If we see prime numbers. Then 31 will be the answer. So which is the correct answer?
Arthy said:
9 years ago
2 - 1 = 1(odd),
6 - 2 = 4(even),
15 - 6 = 9(odd),
31 - 15 = 16(even),
56 - 31= 25(odd),
But 91 - 56 = 45 (odd) so that 91 is the wrong number here.
6 - 2 = 4(even),
15 - 6 = 9(odd),
31 - 15 = 16(even),
56 - 31= 25(odd),
But 91 - 56 = 45 (odd) so that 91 is the wrong number here.
(6)
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.
Aditya said:
9 years ago
2, 5, 15, 131, 530, 13257 find out wrong number of the series.
Jatin Dwivedi said:
8 years ago
Answer should be 31.
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