Hi,

 =  

  =  a1(b2c3-c2b3) - b1(a2c3-c2a3) + c1(a2b3-b2a3) 

             = -4[1*2-(-1*-3)] - [-3(5*2-(-3*7)] + 3[5*-1 - (1*7)]

             = 4  + 93 - 36 = 61 

 

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