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JEE Advanced Mathematics question

MathematicsSequence and SeriesJEE Advanced

If are in HP then is equal to

Answer: (A),(C)

Solution

. Then

b-a==, b-c=.

Missing argument for \frac\frac1{b-a}+Missing argument for \frac\frac1{b-c}=(Missing argument for \frac\frac1a-Missing argument for \frac\frac1c)=ยท==

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Question ID VK-107871