The CAS Registry Mumber 87741-73-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,7,4 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 87741-73: (7*8)+(6*7)+(5*7)+(4*4)+(3*1)+(2*7)+(1*3)=169 169 % 10 = 9 So 87741-73-9 is a valid CAS Registry Number.
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