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If $a, a_{1}, a_{2}, a_{3}, ........... a_{n}, b$ are in AP,
$a, g_{1}, g_{2}, g_{3}, ........... g_{n}, b$ are in GP
$a, h_{1}, h_{2}, h_{3}, ......... h_{n}, b$ are in HP then Which of the following is incorrect

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$h_{r} = \frac{(n + 1) a b}{(n - r + 1) b + r a}$

$g_{r} = {(a^{n - r - 1} b^{r})}^{1 / n + 1}$

$a_{r} = \frac{(n - r + 1) a + r b}{n + 1}$

$a_{r} h_{n - r + 1} = a b$

answer is B.

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