The CAS Registry Mumber 109999-61-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,9,9 and 9 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 109999-61: (8*1)+(7*0)+(6*9)+(5*9)+(4*9)+(3*9)+(2*6)+(1*1)=183 183 % 10 = 3 So 109999-61-3 is a valid CAS Registry Number.
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