The CAS Registry Mumber 891753-73-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,1,7,5 and 3 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 891753-73: (8*8)+(7*9)+(6*1)+(5*7)+(4*5)+(3*3)+(2*7)+(1*3)=214 214 % 10 = 4 So 891753-73-4 is a valid CAS Registry Number.
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