Free, open-source online mathematics for students, teachers and workers

$$(a+b)^n=\binom{n}{0}a^n+\binom{n}{1}a^{n-1}b+\binom{n}{2}a^{n-1}b^2+\cdots+\binom{n}{n-2}a^2b^{n-2}+\binom{n}{n-1}ab^{n-1}+\binom{n}{n}b^n$$





To do