The CAS Registry Mumber 185201-17-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,2,0 and 1 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 185201-17: (8*1)+(7*8)+(6*5)+(5*2)+(4*0)+(3*1)+(2*1)+(1*7)=116 116 % 10 = 6 So 185201-17-6 is a valid CAS Registry Number.
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