If x1,x2,x3,x4 be the roots of the equat...

If `x_1,x_2,x_3,x_4` be the roots of the equation`x^4 + a x^3+b x^2 +cx + d =0`. If `x_1 +x_2 = x_3 + x_4` and `a,b,c,d in R`,then (i) lf a =2, then the value of b-c (ii) `b <0`, then how many different values of a, we may have

A

3

B

2

C

1

D

0

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