The CAS Registry Mumber 77355-57-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,3,5 and 5 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 77355-57: (7*7)+(6*7)+(5*3)+(4*5)+(3*5)+(2*5)+(1*7)=158 158 % 10 = 8 So 77355-57-8 is a valid CAS Registry Number.
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