Question

If 2.5 3.5 x 30 124 625 Then, x ² - 1 - 2x = ?

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 80
B 75
C 62
D 92
E None of these
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