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 3 of 3.
Kumar said:
1 decade ago
2-1,6-2,15-6,31-15,56-31,91-56
1,4,9,16,25,45
last number is clearly wrong because those are perfect squares
1,4,9,16,25,45
last number is clearly wrong because those are perfect squares
Dhivya said:
1 decade ago
Can someone explain this clearly ?
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