The CAS Registry Mumber 129828-31-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,8,2 and 8 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 129828-31: (8*1)+(7*2)+(6*9)+(5*8)+(4*2)+(3*8)+(2*3)+(1*1)=155 155 % 10 = 5 So 129828-31-5 is a valid CAS Registry Number.
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