Which of the following sets are closed under scalar multiplication? (1) The set of all vectors in R of the form (a, b, 9ab). (11) The set of all polynomials a+ bx + cx in P, such that ac = 0. (iii) The set of all matrices in M, such that A- %3D

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A: See the solution below.

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A: check for option B:check for option A:

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A: The given question is solved below.

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A: We have to do both the matrix multiplication.

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A: Solution:-

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