If the first three terms of the expansion of (a + b)^5 are taken, how does it continue?

ab^3 + 5a^2b + 10a^3

a^5 + 10a^4b + 5ab^2

5a^3b^2 + 15a^2b^3 + 10ab^4

15a^2b^3 + 20ab^4 + 5b^5

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