The CAS Registry Mumber 73-77-8 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 7 and 3 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 73-77: (4*7)+(3*3)+(2*7)+(1*7)=58 58 % 10 = 8 So 73-77-8 is a valid CAS Registry Number.
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