The CAS Registry Mumber 89714-84-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,7,1 and 4 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 89714-84: (7*8)+(6*9)+(5*7)+(4*1)+(3*4)+(2*8)+(1*4)=181 181 % 10 = 1 So 89714-84-1 is a valid CAS Registry Number.
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