The CAS Registry Mumber 200074-77-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,0,0,7 and 4 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 200074-77: (8*2)+(7*0)+(6*0)+(5*0)+(4*7)+(3*4)+(2*7)+(1*7)=77 77 % 10 = 7 So 200074-77-7 is a valid CAS Registry Number.
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