The CAS Registry Mumber 349-93-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 3,4 and 9 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 349-93: (5*3)+(4*4)+(3*9)+(2*9)+(1*3)=79 79 % 10 = 9 So 349-93-9 is a valid CAS Registry Number.
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