The CAS Registry Mumber 29493-75-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,4,9 and 3 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 29493-75: (7*2)+(6*9)+(5*4)+(4*9)+(3*3)+(2*7)+(1*5)=152 152 % 10 = 2 So 29493-75-2 is a valid CAS Registry Number.