If A - - - 3 - 2- 6 4 - then AA - 1 - -

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Multiplication of Matrices

If A = [ [ ...

Question

If $A = [\begin{matrix} 3 & - 2 6 & 4 \end{matrix}]$ then $A A^{- 1} = . . . . .$

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^{n} C_{3} :^{n - 1} C_{4} = 20 : 21

n

∣ ∣ ∣ ∣ \begin{matrix} a + b + 2 c & c & c a & b + c + 2 a & a b & b & c + a + 2 b \end{matrix} ∣ ∣ ∣ ∣ = A (a + b + c)^{3}

{(A B)}^{- 1}

A = [\begin{matrix} 1 & 2 1 & - 2 \end{matrix} \begin{matrix} 3 - 3 \end{matrix}]

B = ⎡ ⎢ ⎣ \begin{matrix} 1 & - 1 \begin{matrix} 11 \end{matrix} & \begin{matrix} 2 - 2 \end{matrix} \end{matrix} \begin{matrix} \end{matrix} ⎤ ⎥ ⎦

{(b + c)}^{3} + {(c + a)}^{3} + {(a + b)}^{3} - 3 (b + c) (c + a) (a + b) = 2 (a^{3} + b^{3} + c^{3} - 3 a b c)

^{n - 1} C_{3} +^{n - 1} C_{4} >^{n} C_{3}

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