Find the fourth term in the expansion of the binomial (4x + y)^4
a) 16xy^3
b) 256x^4
c) 64y^4
d) 4xy^3

a) 16xy³

Step-by-step explanation:

For a binomial expansion (a + b)ⁿ, the r+1 term is:

nCr aⁿ⁻ʳ bʳ

Here, a = 4x, b = y, and n = 4.

For the fourth term, r = 3.

₄C₃ (4x)⁴⁻³ (y)³

4 (4x) (y)³

16xy³

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Step-by-step explanation:

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