The CAS Registry Mumber 75614-71-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,6,1 and 4 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 75614-71: (7*7)+(6*5)+(5*6)+(4*1)+(3*4)+(2*7)+(1*1)=140 140 % 10 = 0 So 75614-71-0 is a valid CAS Registry Number.