The CAS Registry Mumber 57176-61-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,1,7 and 6 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 57176-61: (7*5)+(6*7)+(5*1)+(4*7)+(3*6)+(2*6)+(1*1)=141 141 % 10 = 1 So 57176-61-1 is a valid CAS Registry Number.
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