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 D203 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