25. यदि . तथा ! (r #O) का औसत M हो,...
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25. यदि . तथा ! (r #O) का औसत M हो, 2 का औसत कितना तो ।' तथा होगा? (1) 1 - MP (3) 2M - 1 (2) 1 - 2M (4) 2M + 1

11th - 12th Class
Maths
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25. (3) ( frac{x+frac{1}{x}}{2}=M ) ( Rightarrow x+frac{1}{x}=2 mathrm{M} ) अभीष्ट औसत ( =frac{x^{2}+frac{1}{x^{2}}}{2}=frac{left(x+frac{1}{x}right)^{2}-2}{2} ) ( =frac{4 M^{2}-2}{2}=2 M^{2}-1 )
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