The CAS Registry Mumber 190909-33-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,0,9,0 and 9 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 190909-33: (8*1)+(7*9)+(6*0)+(5*9)+(4*0)+(3*9)+(2*3)+(1*3)=152 152 % 10 = 2 So 190909-33-2 is a valid CAS Registry Number.
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