The CAS Registry Mumber 84649-72-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,6,4 and 9 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 84649-72: (7*8)+(6*4)+(5*6)+(4*4)+(3*9)+(2*7)+(1*2)=169 169 % 10 = 9 So 84649-72-9 is a valid CAS Registry Number.
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