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