The CAS Registry Mumber 195455-94-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,4,5 and 5 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 195455-94: (8*1)+(7*9)+(6*5)+(5*4)+(4*5)+(3*5)+(2*9)+(1*4)=178 178 % 10 = 8 So 195455-94-8 is a valid CAS Registry Number.
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