The CAS Registry Mumber 91632-94-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,6,3 and 2 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 91632-94: (7*9)+(6*1)+(5*6)+(4*3)+(3*2)+(2*9)+(1*4)=139 139 % 10 = 9 So 91632-94-9 is a valid CAS Registry Number.
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