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What is the product of following matrix using Strassen’s matrix multiplication algorithm?

$$ A=\begin {bmatrix} 1&3\\ 5 &7 \end{bmatrix}   \;\;\;\;\;\;       B=\begin {bmatrix} 8&4\\ 6 &2 \end{bmatrix}    $$

  1. $C_{11}=80; C_{12}=07;C_{21}=15;C_{22}=34$
  2. $C_{11}=82; C_{12}=26;C_{21}=10;C_{22}=34$
  3. $C_{11}=15; C_{12}=07;C_{21}=80;C_{22}=34$
  4. $C_{11}=26; C_{12}=10;C_{21}=82;C_{22}=34$
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c11 = a11 × b11 + a12 x b21 = 1x8 + 3x6 = 26

similarly doing for other elements option  D will be answer. ( to save time check only for c11 or c21 because only these 2 are distinct in options provided)
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