का मूल्य क्या है? 

  1. वास्तविक मात्रा
  2. एक जटिल मात्रा
  3. शून्य
  4. इनमें से कोई नहीं

Answer (Detailed Solution Below)

Option 1 : वास्तविक मात्रा
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Detailed Solution

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धारणा:

यदि  तो A का सारणिक निम्न द्वारा दिया जाता है: |A| = (a­11 × a22) – (a12 – a21).

गणना:

माना कि, 

⇒ |A| = (2 + i) (i – 1) – (2 – i) (1 + i)

= 2i + i2 – 2 – i – (2 – i + 2i – i2)

= i – 1 – 2 – (2 + i + 1)                   (∵ i2 = -1)

= i – 3 – 2 – i – 1

= -6

∴ |A| वास्तविक संख्या है।

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