The CAS Registry Mumber 19964-67-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,9,6 and 4 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 19964-67: (7*1)+(6*9)+(5*9)+(4*6)+(3*4)+(2*6)+(1*7)=161 161 % 10 = 1 So 19964-67-1 is a valid CAS Registry Number.
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