The CAS Registry Mumber 138560-57-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,5,6 and 0 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 138560-57: (8*1)+(7*3)+(6*8)+(5*5)+(4*6)+(3*0)+(2*5)+(1*7)=143 143 % 10 = 3 So 138560-57-3 is a valid CAS Registry Number.
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