Question : Direction: In the following question, find out the wrong number in the series.
10, 13, 234, 681, 997
Option 1: 681
Option 2: 10
Option 3: 234
Option 4: 13
Correct Answer: 681
Solution : Given:
10, 13, 234, 681, 997
The pattern followed here is –
10 = 1 + 0 = 1 (Perfect square of 1)
13 = 1 + 3 = 4 (Perfect square of 2)
234 = 2 + 3 + 4 = 9 (Perfect square of 3)
681 = 6 + 8 + 1 = 15 (not a perfect square)
997 = 9 + 9 + 7 = 25 (Perfect square of 5)
Therefore, 681 is the wrong number in the series.
Hence, the first option is correct.
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