The CAS Registry Mumber 131791-50-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,7,9 and 1 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 131791-50: (8*1)+(7*3)+(6*1)+(5*7)+(4*9)+(3*1)+(2*5)+(1*0)=119 119 % 10 = 9 So 131791-50-9 is a valid CAS Registry Number.
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