The CAS Registry Mumber 13872-18-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,8,7 and 2 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 13872-18: (7*1)+(6*3)+(5*8)+(4*7)+(3*2)+(2*1)+(1*8)=109 109 % 10 = 9 So 13872-18-9 is a valid CAS Registry Number.
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