The CAS Registry Mumber 64109-67-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,1,0 and 9 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 64109-67: (7*6)+(6*4)+(5*1)+(4*0)+(3*9)+(2*6)+(1*7)=117 117 % 10 = 7 So 64109-67-7 is a valid CAS Registry Number.
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