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Question

If 9 HM's are inserted between 5 and 10, the harmonic mean of entire sequence is

A
910
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B
109
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C
103
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D
203
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Solution

The correct option is D 203
If n HM's are inserted between 'a' and 'b',
HM of the entire series =2ab(a+b)
Here, a = 5 b = 10
HM of entire series =2×5×105+10
=(2×5×10)15=203

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