The CAS Registry Mumber 197441-83-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,4,4 and 1 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 197441-83: (8*1)+(7*9)+(6*7)+(5*4)+(4*4)+(3*1)+(2*8)+(1*3)=171 171 % 10 = 1 So 197441-83-1 is a valid CAS Registry Number.
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