The CAS Registry Mumber 3804-93-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,8,0 and 4 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 3804-93: (6*3)+(5*8)+(4*0)+(3*4)+(2*9)+(1*3)=91 91 % 10 = 1 So 3804-93-1 is a valid CAS Registry Number.
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