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If A is a square matrix such that A2 = I, then (A − I)3 + (A + I)3 − 7A is equal to(a) A(b) I − A(c) I + A(d) 3A |
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Answer» If A is a square matrix such that A2 = I, then (A − I)3 + (A + I)3 − 7A is equal to (a) A (b) I − A (c) I + A (d) 3A |
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