The CAS Registry Mumber 1877-12-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,8,7 and 7 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1877-12: (6*1)+(5*8)+(4*7)+(3*7)+(2*1)+(1*2)=99 99 % 10 = 9 So 1877-12-9 is a valid CAS Registry Number.
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