The CAS Registry Mumber 648414-62-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,8,4,1 and 4 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 648414-62: (8*6)+(7*4)+(6*8)+(5*4)+(4*1)+(3*4)+(2*6)+(1*2)=174 174 % 10 = 4 So 648414-62-4 is a valid CAS Registry Number.
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