The CAS Registry Mumber 17700-70-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,7,0 and 0 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 17700-70: (7*1)+(6*7)+(5*7)+(4*0)+(3*0)+(2*7)+(1*0)=98 98 % 10 = 8 So 17700-70-8 is a valid CAS Registry Number.
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