The CAS Registry Mumber 57717-92-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,7,1 and 7 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 57717-92: (7*5)+(6*7)+(5*7)+(4*1)+(3*7)+(2*9)+(1*2)=157 157 % 10 = 7 So 57717-92-7 is a valid CAS Registry Number.
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