The CAS Registry Mumber 71700-18-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,7,0 and 0 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 71700-18: (7*7)+(6*1)+(5*7)+(4*0)+(3*0)+(2*1)+(1*8)=100 100 % 10 = 0 So 71700-18-0 is a valid CAS Registry Number.
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