The CAS Registry Mumber 195259-91-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,2,5 and 9 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 195259-91: (8*1)+(7*9)+(6*5)+(5*2)+(4*5)+(3*9)+(2*9)+(1*1)=177 177 % 10 = 7 So 195259-91-7 is a valid CAS Registry Number.
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