The CAS Registry Mumber 84371-69-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,3,7 and 1 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 84371-69: (7*8)+(6*4)+(5*3)+(4*7)+(3*1)+(2*6)+(1*9)=147 147 % 10 = 7 So 84371-69-7 is a valid CAS Registry Number.
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