The CAS Registry Mumber 200721-96-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,0,7,2 and 1 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 200721-96: (8*2)+(7*0)+(6*0)+(5*7)+(4*2)+(3*1)+(2*9)+(1*6)=86 86 % 10 = 6 So 200721-96-6 is a valid CAS Registry Number.
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