The CAS Registry Mumber 844683-56-3 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, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 844683-56: (8*8)+(7*4)+(6*4)+(5*6)+(4*8)+(3*3)+(2*5)+(1*6)=203 203 % 10 = 3 So 844683-56-3 is a valid CAS Registry Number.
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