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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