The CAS Registry Mumber 104621-27-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,4,6,2 and 1 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 104621-27: (8*1)+(7*0)+(6*4)+(5*6)+(4*2)+(3*1)+(2*2)+(1*7)=84 84 % 10 = 4 So 104621-27-4 is a valid CAS Registry Number.
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