The CAS Registry Mumber 3955-85-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,9,5 and 5 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 3955-85: (6*3)+(5*9)+(4*5)+(3*5)+(2*8)+(1*5)=119 119 % 10 = 9 So 3955-85-9 is a valid CAS Registry Number.
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