The CAS Registry Mumber 42262-66-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,2,6 and 2 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 42262-66: (7*4)+(6*2)+(5*2)+(4*6)+(3*2)+(2*6)+(1*6)=98 98 % 10 = 8 So 42262-66-8 is a valid CAS Registry Number.
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