The CAS Registry Mumber 81874-44-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,7 and 4 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 81874-44: (7*8)+(6*1)+(5*8)+(4*7)+(3*4)+(2*4)+(1*4)=154 154 % 10 = 4 So 81874-44-4 is a valid CAS Registry Number.
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