The CAS Registry Mumber 117715-57-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,7,1 and 5 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 117715-57: (8*1)+(7*1)+(6*7)+(5*7)+(4*1)+(3*5)+(2*5)+(1*7)=128 128 % 10 = 8 So 117715-57-8 is a valid CAS Registry Number.
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