The CAS Registry Mumber 73846-19-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,8,4 and 6 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 73846-19: (7*7)+(6*3)+(5*8)+(4*4)+(3*6)+(2*1)+(1*9)=152 152 % 10 = 2 So 73846-19-2 is a valid CAS Registry Number.