Question
If 3 2 1 x 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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