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If $x, y, z$ are in A.P. and A.M. of $x$ and $y$ is a and that to $y$ and $z$ is $b$ , then A.M. of $a$ and $b$ is.
$x$
$y$
$z$
$\frac{1}{2 (x + y)}$

x

\frac{1}{2 (x + y)}

y

z

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