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2 If A = [123], B = 3 and C= (a) AB 1 5 02 (b) BA 7 then which of the following is

2 If A = [123], B = 3 and C= (a) AB 1 5 02 (b) BA 7 then which of the following is defined (c) (AB).C (d) (AC).B

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