Question
If 4    x     4      7   Â
  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 :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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