The CAS Registry Mumber 217640-21-6 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, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 217640-21: (8*2)+(7*1)+(6*7)+(5*6)+(4*4)+(3*0)+(2*2)+(1*1)=116 116 % 10 = 6 So 217640-21-6 is a valid CAS Registry Number.
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