Exams › IBPS PO › Quantitative Aptitude
Passage: Series I is a missing series, while Series II is a wrong-number series that follows the pattern of Series I only. I. 11, P, 181, 350, 639, 1000 II. 242, 251, 255, 280, 329, 450, 619 If y is the wrong number in Series II, then find the value of 2y + 1.
- 493
- 561
- 503
- 511
Correct answer: 503
Solution
Series I follows the pattern of cubes plus 10: 1^3+10=11, 2^3+10=18, 3^3+10=37, etc., so the intended pattern helps identify the wrong term in Series II. In Series II, all terms fit the same pattern except 251, which should be 252. Thus y = 251, and 2y + 1 = 503.
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