The CAS Registry Mumber 18768-61-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,7,6 and 8 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 18768-61: (7*1)+(6*8)+(5*7)+(4*6)+(3*8)+(2*6)+(1*1)=151 151 % 10 = 1 So 18768-61-1 is a valid CAS Registry Number.
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