A) 6.4
B) 6.7
C) 6.85
D) 7.8
Correct Answer: C
[c] H.M. of 4, 8, 16 $ =\frac{3}{\frac{1}{4}+\frac{1}{8}+\frac{1}{16}}=\frac{48}{7}=6.85 $
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