The CAS Registry Mumber 78311-68-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,3,1 and 1 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 78311-68: (7*7)+(6*8)+(5*3)+(4*1)+(3*1)+(2*6)+(1*8)=139 139 % 10 = 9 So 78311-68-9 is a valid CAS Registry Number.
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