The CAS Registry Mumber 828921-47-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,2,8,9,2 and 1 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 828921-47: (8*8)+(7*2)+(6*8)+(5*9)+(4*2)+(3*1)+(2*4)+(1*7)=197 197 % 10 = 7 So 828921-47-7 is a valid CAS Registry Number.
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