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If a, b, c, d in R then the equation (x^...

If a, b, c, d `in R` then the equation `(x^(2)+ax-3b) (x^(2)-cx+b) (x^(2)-dx+2b)=0` has

A

6 real roots

B

at least 2 real roots

C

4 real roots

D

3 real roots

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The correct Answer is:
B
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