The CAS Registry Mumber 83855-50-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,8,5 and 5 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 83855-50: (7*8)+(6*3)+(5*8)+(4*5)+(3*5)+(2*5)+(1*0)=159 159 % 10 = 9 So 83855-50-9 is a valid CAS Registry Number.
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