Binomial Theorem · Exercise 49

In the expansion of ${\left(a+b\right)}^n,$ the coefficient of $a^{n-k}{b}^k$ is the same as the coefficient of which other term?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §13.6 Binomial Theorem · Exercise 49