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    Question

    If 4     x    

      4           7          15        38.5 Then,  ( x  + 1) ( x  - 1) = ? In each of the following questions a number series is given.  One term of the series is denoted by 'x' . You have to calculate the value of  'x' and by using the value of  'x' ,  you have to replace the question mark (?) in the following questions :
    A 8 Correct Answer Incorrect Answer
    B 16 Correct Answer Incorrect Answer
    C 5 Correct Answer Incorrect Answer
    D 12 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    4 × 0.5 + 1 = 3 3×1 + 1 = 4 4 × 1.5 + 1 = 7 7× 2 + 1 = 15 15×2.5 + 1 = 38.5 Hence, x= 3 Hence, (3 + 1) (3 - 1) = 4 × 2 = 8

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