If the variance of the terms in an increasing A.P., \( b_{1} \), \(...

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If the variance of the terms in an increasing A.P., \( b_{1} \),
\( \mathrm{P} \) \( \mathrm{b}_{2}, \mathrm{~b}_{3}, \ldots, \mathrm{b}_{11} \) is 90 , then the common difference of this
A.P. is
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