The CAS Registry Mumber 218600-51-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,8,6,0 and 0 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 218600-51: (8*2)+(7*1)+(6*8)+(5*6)+(4*0)+(3*0)+(2*5)+(1*1)=112 112 % 10 = 2 So 218600-51-2 is a valid CAS Registry Number.
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