The CAS Registry Mumber 197715-73-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,7,1 and 5 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 197715-73: (8*1)+(7*9)+(6*7)+(5*7)+(4*1)+(3*5)+(2*7)+(1*3)=184 184 % 10 = 4 So 197715-73-4 is a valid CAS Registry Number.
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