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Like terms must have the exact same variables raised to the exact same powers.
Only option 4 has the same variable part (xy) in both terms.
Hence, option 4 is the correct option.
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The coefficient of x in - 6 xyz2 is
The degree of the polynomial ma2b3 + 6ab2 - m is
The expression -3h4 + 7(h - 1) is a