The CAS Registry Mumber 87569-97-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,5,6 and 9 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 87569-97: (7*8)+(6*7)+(5*5)+(4*6)+(3*9)+(2*9)+(1*7)=199 199 % 10 = 9 So 87569-97-9 is a valid CAS Registry Number.
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