781-20-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 781-20-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,8 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 781-20:
(5*7)+(4*8)+(3*1)+(2*2)+(1*0)=74
74 % 10 = 4
So 781-20-4 is a valid CAS Registry Number.