Question

If 4     x       4           7          15        38.5 Then,  ( x  + 1) ( x  - 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 8
B 16
C 5
D 12
E None of these
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