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If A = [[1,2],[4,2]] then show that |2A|= 4|A|

Answer»

SOLUTION : `|A| = |[1,2],[4,2]| =2-8 = -6
2A = 2|[1,2],[4,2]| = |[2,4],[8,4]|,|2A|= |[2,4],[8,4]| = 8-32 = -24 = 4xx-6 = 4|A|`


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