The CAS Registry Mumber 50801-20-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,0,8,0 and 1 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 50801-20: (7*5)+(6*0)+(5*8)+(4*0)+(3*1)+(2*2)+(1*0)=82 82 % 10 = 2 So 50801-20-2 is a valid CAS Registry Number.
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