1
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
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If H is the harmonic mean of numbers 1, 2, 22, 23, ......2n-1 what is n/H equal to ? 
A
$2-\frac{1}{2^{n+1}}$
B
$2-\frac{1}{2^{n-1}}$
C
$2+\frac{1}{2^{n-1}}$
D
$2-\frac{1}{2^{n}}$
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