The CAS Registry Mumber 50717-99-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,0,7,1 and 7 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 50717-99: (7*5)+(6*0)+(5*7)+(4*1)+(3*7)+(2*9)+(1*9)=122 122 % 10 = 2 So 50717-99-2 is a valid CAS Registry Number.
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