What are the odd and even terms in binomial?

What are the odd and even terms in binomial?

Let me give you an example
The square of (a + b) = the square of a + 2Ab + B
Where the square of a and the square of B are the first term and the third term is the odd term
2Ab is the second even term
The square of (a + b) is the simplest quadratic term. When the square is not more times, the expansion principle is the same

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