A formula that can be used to find the coefficient of any term in the expansion of the nth power of a binomial of the form (a + b).
The coefficients of the expansion of (a + b)n can be obtained using the numbers from Pascal’s triangle.
Examples
(a + b)1 = (a + b)
(a + b)2 = a2 + 2ab + b2
(a + b)3 = a3 + 3a2b + 3ab2 + b3
(a + b)4 = a4 + 4a3b + 6a2b2 + 4ab3 + b4