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Q.

If the roots a(bc)x2+b(ca)x+c(ab)=0 are equal, then a, b, c are in 

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a

A.P

b

H.P

c

No define sequence

d

G.P

answer is C.

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Detailed Solution

a(bc)x2+b(ca)x+c(ab)=0

a(bc)+b(ca)+c(ab)=0

Then roots are 1,c(ab)a(bc)

1=acbcabac

abac=acbc

2ac=b(a+c)

b=2aca+c

 a,b,c are in H.P

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