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Question

If 1bāˆ’a+1bāˆ’c=1a+1c, then a,b,c, are in


A

A.P

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B

G.P

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C

H.P

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D

none of these

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Solution

The correct option is C

H.P


1ba+1bc=1a+1c

2bac(ba)(bc)=a+cac

2abca2cac2=(b2abbc+ac)(a+c)

2abca2cac2=b2aa2babc+a2c+cb2abcbc2+ac2

4abc2a2c2ac2b2a+a2bcb2+bc2=0

(2b1a1c)=0

2b=1a+1c answer H.P


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