Teaching DSSSB PGT Mock Test 2025 Engineering Mathematics Linear Algebra

If A, B, C are square matrices of the same order, then which of the following is true?

1
ABC = CBA
2
(AB)2 = A2B2
3
AB = 0 ⇒ then always either A = 0 or B = 0
4
AB = I ⇒ AB = BA
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