Answer: T₃.
- A T₂
- B T₄
- C T₅
- D T₃
Correct answer: D. T₃
Explanation: n=4 (even). Middle term is T(n/2+1) = T(3). So the 3rd term.
Row n of Pascal's triangle gives the coefficients nC0, nC1, ..., nCn for the expansion of (a+b)ⁿ; each number is the sum of the two numbers diagonally above it, a direct visual proof of the identity nCr = (n-1)C(r-1) + (n-1)Cr.
Concept context
Expansion of (a+b) n , general term, middle term, binomial coefficients, and greatest term