If the roots of the equation a(b - c)x^2...

If the roots of the equation `a(b - c)x^2 + b(c- a)x+ c(a-b)=0` are equal, then which of the following is true?

A

2b = a + c

B

`b^(2) = a c`

C

`(2)/(b) = (1)/(a) + (1)/(c)`

D

`(1)/(b) =(1)/(a) + (1)/(c )`

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