The CAS Registry Mumber 17879-91-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,8,7 and 9 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 17879-91: (7*1)+(6*7)+(5*8)+(4*7)+(3*9)+(2*9)+(1*1)=163 163 % 10 = 3 So 17879-91-3 is a valid CAS Registry Number.
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