The CAS Registry Mumber 13928-09-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,9,2 and 8 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 13928-09: (7*1)+(6*3)+(5*9)+(4*2)+(3*8)+(2*0)+(1*9)=111 111 % 10 = 1 So 13928-09-1 is a valid CAS Registry Number.
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