The CAS Registry Mumber 13109-85-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,1,0 and 9 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 13109-85: (7*1)+(6*3)+(5*1)+(4*0)+(3*9)+(2*8)+(1*5)=78 78 % 10 = 8 So 13109-85-8 is a valid CAS Registry Number.
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