The CAS Registry Mumber 50609-99-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,0,6,0 and 9 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 50609-99: (7*5)+(6*0)+(5*6)+(4*0)+(3*9)+(2*9)+(1*9)=119 119 % 10 = 9 So 50609-99-9 is a valid CAS Registry Number.
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