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IBPS Specialist Officers Exam: Quantitative Aptitude-Number Series-Concept & Sample Questions

Jan 6, 2016 12:32 IST

    Institute of Banking and Personnel Selection (IBPS) will conduct common written examination for recruitment of Specialist Officers (SO). The IBPS SO Exam will be conducted in the last week of January 2016.

    The banking team of jagranjosh.com has brought concept and sample questions for Number series (Quantitative Aptitude). The concept provided by us will help you to understand the topic. The sample questions offered by us are framed by keeping in view need of the question paper.

    Type 1 To Find the Missing Term

    Directions (Q. Nos. 1 to 2): Find the missing term in each oy the following number series.

    Example 1 13, 18, 16, 21, 19, 24,?

    Solution: Clearly, the given series follows the pattern +5, -2, +5, -2, …….

    So,                                           Missing term = 24 – 2 = 22

    Example 2 3333, 3233, 3143, 3063,?

    Solution: Clearly, the given series follows the pattern -100, -90, -80, -70, ………

    So,                                           Missing term = 2993

    Triangular Pattern Series

    In such a series, the difference between the consecutive terms of a series, again form a series. The difference between the consecutive terms of the new series so formed again forms a series. This pattern continues till we attain a constant difference between the consecutive terms of the series.

    Example 3 4, 18, 48, 100, 180, 294,?

    Solution:

    So, the missing term = 34 + 6 = 40

    Then, 40 + 114 = 154 and 294 + 154 = 448

    Type 2 To Pick the Odd One

    Directions (Q. Nos. 5 to 6): In each of the following number series, one of the given numbers is wrong. Find out the number.

    Example 4 2, 7, 14, 23, 36, 47, 62

    Solution: Clearly, the correct sequence is 22 - 2, 32 - 2, 42 - 2, 52 - 2, 62 - 2, 72 - 2, 82 - 2.

    So, 36 is wrong and should be replaced by (62 -2) =34

    Example 5 1, 27, 125, 343, 729, 1321

    Solution: Clearly, the correct sequence is 13, 33, 53, 73, 93, 113

    So, 1321 is wrong and should be replaced by 113 = 1331

    Sample Questions with Solutions and Explanations

    DISCLAIMER: JPL and its affiliates shall have no liability for any views, thoughts and comments expressed on this article.

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