The CAS Registry Mumber 77397-93-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,3,9 and 7 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 77397-93: (7*7)+(6*7)+(5*3)+(4*9)+(3*7)+(2*9)+(1*3)=184 184 % 10 = 4 So 77397-93-4 is a valid CAS Registry Number.
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