The CAS Registry Mumber 195539-61-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,5,3 and 9 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 195539-61: (8*1)+(7*9)+(6*5)+(5*5)+(4*3)+(3*9)+(2*6)+(1*1)=178 178 % 10 = 8 So 195539-61-8 is a valid CAS Registry Number.
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