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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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