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Both students are incorrect.
A binomial is an algebraic expression with two terms. The expression 3x^7y^5 only has one term, so it cannot be a binomial.
The degree of a monomial is the sum of the exponents of its variables. In this expression, the variable x has an exponent of 7 and the variable y has an exponent of 5. Therefore, the degree of the expression is 7 + 5 = 12.
So, the expression is a monomial with a degree of 12.