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The coefficients of the (r-1), r th and (r+1)th terms in the expansion of (x+n)n are in the ratio 1:3:5. Find n and r. |
| Answer» The coefficients of the (r-1), r th and (r+1)th terms in the expansion of (x+n)n are in the ratio 1:3:5. Find n and r. | |