The CAS Registry Mumber 33970-45-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,9,7 and 0 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 33970-45: (7*3)+(6*3)+(5*9)+(4*7)+(3*0)+(2*4)+(1*5)=125 125 % 10 = 5 So 33970-45-5 is a valid CAS Registry Number.
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