The CAS Registry Mumber 618102-57-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,1,8,1,0 and 2 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 618102-57: (8*6)+(7*1)+(6*8)+(5*1)+(4*0)+(3*2)+(2*5)+(1*7)=131 131 % 10 = 1 So 618102-57-1 is a valid CAS Registry Number.
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