The CAS Registry Mumber 155233-33-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,5,2,3 and 3 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 155233-33: (8*1)+(7*5)+(6*5)+(5*2)+(4*3)+(3*3)+(2*3)+(1*3)=113 113 % 10 = 3 So 155233-33-3 is a valid CAS Registry Number.
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