The CAS Registry Mumber 64057-73-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,0,5 and 7 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 64057-73: (7*6)+(6*4)+(5*0)+(4*5)+(3*7)+(2*7)+(1*3)=124 124 % 10 = 4 So 64057-73-4 is a valid CAS Registry Number.
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