The CAS Registry Mumber 468742-68-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,6,8,7,4 and 2 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 468742-68: (8*4)+(7*6)+(6*8)+(5*7)+(4*4)+(3*2)+(2*6)+(1*8)=199 199 % 10 = 9 So 468742-68-9 is a valid CAS Registry Number.
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