20. If A & B are two non singular matrices of order 3 × 3 such that AT + B = I & BAT = –B, then which is/are always true (where XT denotes transpose of X and I denotes unit matrix)- (A) |B| = 2 (B) |B| = 8 (C) |A| = –1 (D) |A| = 1
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(B) |B| = 8
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