The CAS Registry Mumber 217640-18-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,6,4 and 0 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 217640-18: (8*2)+(7*1)+(6*7)+(5*6)+(4*4)+(3*0)+(2*1)+(1*8)=121 121 % 10 = 1 So 217640-18-1 is a valid CAS Registry Number.
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