The CAS Registry Mumber 844683-39-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,4,6,8 and 3 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 844683-39: (8*8)+(7*4)+(6*4)+(5*6)+(4*8)+(3*3)+(2*3)+(1*9)=202 202 % 10 = 2 So 844683-39-2 is a valid CAS Registry Number.
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