The CAS Registry Mumber 205830-20-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,5,8,3 and 0 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 205830-20: (8*2)+(7*0)+(6*5)+(5*8)+(4*3)+(3*0)+(2*2)+(1*0)=102 102 % 10 = 2 So 205830-20-2 is a valid CAS Registry Number.
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