IPMAT Indore 2023 (SA) - If three consecutive coefficients in the expansion of (x+y)^n are in the ratio 1:9:63, then the value of n is | PYQs + Solutions

IPMAT Indore 2023

Modern Math

Binomial Theorem

Medium

If three consecutive coefficients in the expansion of $(x+y)^n$ are in the ratio $1:9:63$ , then the value of $n$ is

Entered answer:

✅ Correct Answer: 36

Updation:

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In the 2nd last step of the solution

5n - 35 = 4n + 1

n = 1 + 35 \rightarrow\ n = 36