Question

If  2.5   3.5           x         30          124       625 Then,  x² - 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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