The CAS Registry Mumber 39974-62-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,9,7 and 4 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 39974-62: (7*3)+(6*9)+(5*9)+(4*7)+(3*4)+(2*6)+(1*2)=174 174 % 10 = 4 So 39974-62-4 is a valid CAS Registry Number.
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