The CAS Registry Mumber 845823-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,5,8,2 and 3 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 845823-20: (8*8)+(7*4)+(6*5)+(5*8)+(4*2)+(3*3)+(2*2)+(1*0)=183 183 % 10 = 3 So 845823-20-3 is a valid CAS Registry Number.
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