The CAS Registry Mumber 61968-90-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,1,9,6 and 8 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 61968-90: (7*6)+(6*1)+(5*9)+(4*6)+(3*8)+(2*9)+(1*0)=159 159 % 10 = 9 So 61968-90-9 is a valid CAS Registry Number.
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