The CAS Registry Mumber 97660-61-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,6,6 and 0 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 97660-61: (7*9)+(6*7)+(5*6)+(4*6)+(3*0)+(2*6)+(1*1)=172 172 % 10 = 2 So 97660-61-2 is a valid CAS Registry Number.
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