The CAS Registry Mumber 906720-90-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,0,6,7,2 and 0 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 906720-90: (8*9)+(7*0)+(6*6)+(5*7)+(4*2)+(3*0)+(2*9)+(1*0)=169 169 % 10 = 9 So 906720-90-9 is a valid CAS Registry Number.
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