The CAS Registry Mumber 77161-22-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,1,6 and 1 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 77161-22: (7*7)+(6*7)+(5*1)+(4*6)+(3*1)+(2*2)+(1*2)=129 129 % 10 = 9 So 77161-22-9 is a valid CAS Registry Number.
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