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 :
A 80
B 675
C 563
D 392
E None of these
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