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प्रश्न
If A = `[(1,2),(4,2)]` then show that |2A| = 4|A|
उत्तर
A = `[(1,2),(4,2)]`
=>` 2"A" = [(2,4),(8,4)]`
∴ |A| = `|(1,2),(4,2)|`
= 2 - 8
= - 6 ....(1)
|2A| = `|(2,4),(8,4)|`
= 2 × 4 - 4 × 8
= 8 - 32
= - 24 ...(2)
From equations (1) and (2),
|2A| = 4|A|
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