Çözüldü Coefficient of a Specific Term in Binomial Expansion

From Cambridge Assessment Test of Mathematics for University Admission 2019 – Paper 1

https://i72.servimg.com/u/f72/19/97/10/39/cat10.png

For (a + b)^n, if any term is (a^k)·(b^m), then the coefficient of that term is C(n, k) = C(n, m). So, in (1 + x)^n for the term
x = (1^0)·(x^1) the coefficient is;


https://www.admissionstesting.org/I...ics-for-university-admission-2019-paper-1.pdf (Page 5, Question 3)
https://www.admissionstesting.org/I...versity-admission-2019-papers-answer-keys.pdf (Answers)