What does “Binomial expansion” actually mean in Binomial Theorem, and why does it matter for JEE?
(a+b)^n expands as a sum of terms nCr·a^(n−r)·b^r, with coefficients from Pascal's triangle.
In simple words: (a+b)^n expands as a sum of terms nCr·a^(n−r)·b^r, with coefficients from Pascal's triangle. Getting Binomial expansion clear matters because JEE questions on Binomial Theorem usually test this idea directly, not just a formula you memorised.
Key point
Binomial expansion
Common mistake
forgetting that the powers of a and b add up to n in every term.
Memory tip
in each term the exponents of a and b sum to n.
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