The CAS Registry Mumber 94134-87-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,1,3 and 4 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 94134-87: (7*9)+(6*4)+(5*1)+(4*3)+(3*4)+(2*8)+(1*7)=139 139 % 10 = 9 So 94134-87-9 is a valid CAS Registry Number.
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