The CAS Registry Mumber 179865-16-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,9,8,6 and 5 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 179865-16: (8*1)+(7*7)+(6*9)+(5*8)+(4*6)+(3*5)+(2*1)+(1*6)=198 198 % 10 = 8 So 179865-16-8 is a valid CAS Registry Number.
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