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Q.

If a, b, c are in H.P. and a2, b2, c2 are in H.P. then

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a

a = b = c

b

2b= 3a+ c

c

b2=ac8

d

2c = 3b+ a

answer is A.

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Detailed Solution

a,b,cH.Pb=2aca+c a2,b2,c2H.Pb2=2a2c2a2+c2 2aca+c2=2a2c2a2+c24a+c2=2a2+c2 2a2+2c2=a2+c2+2aca2+c2-2ac=0 (a-c)2=0  a=c    b=2aca+c=2a22a=a

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