The CAS Registry Mumber 67023-79-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,0,2 and 3 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 67023-79: (7*6)+(6*7)+(5*0)+(4*2)+(3*3)+(2*7)+(1*9)=124 124 % 10 = 4 So 67023-79-4 is a valid CAS Registry Number.
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