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

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


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