The CAS Registry Mumber 68071-91-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,0,7 and 1 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 68071-91: (7*6)+(6*8)+(5*0)+(4*7)+(3*1)+(2*9)+(1*1)=140 140 % 10 = 0 So 68071-91-0 is a valid CAS Registry Number.
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