The CAS Registry Mumber 844856-50-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,4,8,5 and 6 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 844856-50: (8*8)+(7*4)+(6*4)+(5*8)+(4*5)+(3*6)+(2*5)+(1*0)=204 204 % 10 = 4 So 844856-50-4 is a valid CAS Registry Number.
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