Question
If      3   2    1    x   Â
  4     12.5, then,  (x²-1) (x²+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
3 ×  0.5 + 0.5 = 2 2 ×  1 - 1 = 1 1 ×  1.5 + 1.5 = 3 3 ×  2 - 2 = 4 4 ×  2.5 + 2.5 = 12.5 Hence, x= 3 Hence, (3²-1) (3²+1) = (9-1) (9+1) = 8 × 10 = 80
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