The CAS Registry Mumber 12719-90-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,7,1 and 9 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 12719-90: (7*1)+(6*2)+(5*7)+(4*1)+(3*9)+(2*9)+(1*0)=103 103 % 10 = 3 So 12719-90-3 is a valid CAS Registry Number.
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