The CAS Registry Mumber 1221791-69-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,2,1,7,9 and 1 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 1221791-69: (9*1)+(8*2)+(7*2)+(6*1)+(5*7)+(4*9)+(3*1)+(2*6)+(1*9)=140 140 % 10 = 0 So 1221791-69-0 is a valid CAS Registry Number.
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