3 and 4 .Determinants and Matrices
easy

आव्यूह $A = \frac{1}{3}\left[ {\begin{array}{*{20}{c}}1&2&2\\2&1&{ - 2}\\{ - 2}&2&{ - 1}\end{array}} \right]$ है      

A

लाम्बिक (Orthogonal)

B

अन्तर्वलनीय (Involutory)

C

वर्गसम (Idempotent)

D

शून्यभावी (Nilpotent)

Solution

(a) चूँकि दिया गया आव्यूह $A = \frac{1}{3}\left[ {\begin{array}{*{20}{c}}1&2&2\\2&1&{ – 2}\\{ – 2}&2&{ – 1}\end{array}\,} \right]$$A{A^T} = {A^T}A = {I_{(3 \times 3)}}$.

 अत:  $A$ लाम्बिक आव्यूह है

Standard 12
Mathematics

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