The CAS Registry Mumber 119831-19-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,8,3 and 1 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 119831-19: (8*1)+(7*1)+(6*9)+(5*8)+(4*3)+(3*1)+(2*1)+(1*9)=135 135 % 10 = 5 So 119831-19-5 is a valid CAS Registry Number.
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