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    Question

    In each of the following questions the number series is given. One term of the series is denoted by x. You have to calculate of value of x and by using the value of x, you have to solve the following questions.

    If 4 10 16 26 x 50 Then find the value of

    (x² - 1) + ( x² + 1).
    A 2582 Correct Answer Incorrect Answer
    B 2592 Correct Answer Incorrect Answer
    C 2492 Correct Answer Incorrect Answer
    D 2952 Correct Answer Incorrect Answer
    E 2852 Correct Answer Incorrect Answer

    Solution

    2² = 4 3² + 1 = 10 4² = 16 5² + 1 = 26 6² = 36 7² + 1 = 50 Then, (x² - 1) + ( x² + 1) ⇒ (36² - 1) + (36² + 1) ⇒ (1296 – 1) + (1296 + 1) ⇒ 1295 + 1297 = 2592

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