The CAS Registry Mumber 12768-31-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,7,6 and 8 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 12768-31: (7*1)+(6*2)+(5*7)+(4*6)+(3*8)+(2*3)+(1*1)=109 109 % 10 = 9 So 12768-31-9 is a valid CAS Registry Number.
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