New Enroll in RBI Grade B New Batch - Starts on May 21

    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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