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Which of the following sets are closed under addition? (i) The set of all vectors in...

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Advance Math

Which of the following sets are closed under addition?
(i) The set of all vectors in R2 of theform (a, b) where b = a.
(ii) The set of all 2 × 2 matrices that have the vector[-2  -3]T as an eigenvector.
(iii) The set of all polynomials in P2 ofthe form a0 + a1 x+ a2 x2 wherea0 = a22.

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