The CAS Registry Mumber 142246-64-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,2,4 and 6 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 142246-64: (8*1)+(7*4)+(6*2)+(5*2)+(4*4)+(3*6)+(2*6)+(1*4)=108 108 % 10 = 8 So 142246-64-8 is a valid CAS Registry Number.
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