The CAS Registry Mumber 137889-17-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,8,8 and 9 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 137889-17: (8*1)+(7*3)+(6*7)+(5*8)+(4*8)+(3*9)+(2*1)+(1*7)=179 179 % 10 = 9 So 137889-17-9 is a valid CAS Registry Number.
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