जर A क्रम 3 ची अविकारक सारणी असेल, तर त्याचा व्यस्त (A-1) किती असेल?

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NDA (Held On: 21 Apr 2019) Maths Previous Year paper
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  1. शून्य सारणीच्या समान
  2. ​A च्या समान 
  3. 3A च्या समान 
  4. अस्तित्वात नाही

Answer (Detailed Solution Below)

Option 2 : ​A च्या समान 
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संकल्पना

A हा क्रम n ची कोणतीही सारणी असेल आणि तिची व्यस्त सारणी अस्तित्वात असेल तर आपण खालीलप्रमाणे लिहू शकतो

AA-1 = A-1A = I, जेथे I = n क्रमाची अविकारक सारणी

गणना

दिलेल्याप्रमाणे: A क्रम 3 ची अविकारक सारणी असेल म्हणजे, A = I

दोन्ही बाजूंना A-1 द्वारे गुणाकार केल्यास, आपणास खालीलप्रमाणे मिळते,

⇒ AA-1 = IA-1

⇒ I = A-1 [∵ सारणीला अविकारक सारणीने गुणाकार केल्यास सारणी मिळते, म्हणजे,  AI = A]

⇒ A = A-1
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