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\begin{array} { l } { \text { If } ^ { n - 1 } C _ { r } : ^ { n } C _ { r } : ^ { n + 1 } C _ { r } = 6 : 9 : 13 , \text { then find the } } \\ { \text { values of } n \text { and } r . } \end{array} |
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Answer» thanks a lot Girija Madan |
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