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The Coefficients of the (R – 1)Th, Rth and (R + 1)Th Terms in the Expansion of (X + 1)N Are in the Ratio 1:3:5. Find N and R. - CBSE (Arts) Class 11 - Mathematics

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Question

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

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Solution The Coefficients of the (R – 1)Th, Rth and (R + 1)Th Terms in the Expansion of (X + 1)N Are in the Ratio 1:3:5. Find N and R. Concept: General and Middle Terms.
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