If the co-efficients of \( (2 r+4) \) th and \( (r-2) \) th terms in the expansion of \( (1+x)^{....

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If the co-efficients of \( (2 r+4) \) th and \( (r-2) \) th terms in the expansion of \( (1+x)^{18} \) are equal, find \( \mathrm{r} \).
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