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Trinomials are polynomials with three terms. ie. x2+2x+1
There are 3 factorial ways to arrange the letters DDA, where factorial (denoted as 3!) is the product of all positive integers up to 3 (3 x 2 x 1). So, there are 6 different ways to arrange the letters DDA: DDA, DAD, ADD, DDA, DAD, ADD.
A trinomial is a polynomial with three terms.
Giving an example of the problem.
I think it's just polynomials after that. I don't think there's a quadranomial or anything.