The CAS Registry Mumber 874218-51-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,4,2,1 and 8 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 874218-51: (8*8)+(7*7)+(6*4)+(5*2)+(4*1)+(3*8)+(2*5)+(1*1)=186 186 % 10 = 6 So 874218-51-6 is a valid CAS Registry Number.
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