3 and 4 .Determinants and Matrices
normal

જો $A$ એ $2$ કક્ષાવાળો  શૂન્યઘાતી શ્રેણિક હોય તો $A(I_2+A)^{51}$ મેળવો.  (કે જ્યાં $I_2$ એ $2$ કક્ષાવાળો એકમ શ્રેણિક છે .)

A

$A^{51}$

B

$I_2$

C

શૂન્ય શ્રેણિક

D

$A$

Solution

$A^{2}=O \Rightarrow A^{3}=O, A^{4}=O$

$ \Rightarrow \mathrm{A}^{51}= \mathrm{O}$

$(\mathrm{I}+\mathrm{A})^{2} =\mathrm{A}^{2}+2 \mathrm{A}+\mathrm{I}=2 \mathrm{A}+\mathrm{I} $

$(\mathrm{I}+\mathrm{A})^{3} =(\mathrm{I}+\mathrm{A})(2 \mathrm{A}+\mathrm{I}) $

$=2 \mathrm{A}^{2}+3 \mathrm{A}+\mathrm{I}$

$=3 \mathrm{A}+\mathrm{I}$

similarly $(\mathrm{I}+\mathrm{A})^{51}=51 \mathrm{A}+\mathrm{I}$

$\mathrm{A}(\mathrm{I}+\mathrm{A})^{51}=51 \mathrm{A}^{2}+\mathrm{A}=\mathrm{A}$

Standard 12
Mathematics

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