The CAS Registry Mumber 1309980-57-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,0,9,9,8 and 0 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1309980-57: (9*1)+(8*3)+(7*0)+(6*9)+(5*9)+(4*8)+(3*0)+(2*5)+(1*7)=181 181 % 10 = 1 So 1309980-57-1 is a valid CAS Registry Number.
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