Question
Find the wrong number in the given number series.
2, 5, 10, 17, 26, 38, 50Solution
Observe each term in relation to its position: 1st term: 1² + 1 = 2 2nd term: 2² + 1 = 5 3rd term: 3² + 1 = 10 4th term: 4² + 1 = 17 5th term: 5² + 1 = 26 6th term: 6² + 1 = 37 7th term: 7² + 1 = 50 So the correct sequence is: 2, 5, 10, 17, 26, 37, 50 Given term 38 at the 6th position is incorrect. Therefore, 38 is the wrong number.
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