Determine which of the following sets of matrices are subrings of M2(R) with the usual addition and mul- tiplication of matrices. For each of the subrings determine if they are commutative rings, rings with identity, integral domains, division rings, fields. Prove your answers. (1) R1 : a,

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A: Find the term indicated in the expansion (x + 2y)6; third term.

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A:

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A:

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A:

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A: The expansion of the provided expression is given by,