The CAS Registry Mumber 79761-67-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,7,6 and 1 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 79761-67: (7*7)+(6*9)+(5*7)+(4*6)+(3*1)+(2*6)+(1*7)=184 184 % 10 = 4 So 79761-67-4 is a valid CAS Registry Number.
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