The CAS Registry Mumber 442632-42-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,2,6,3 and 2 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 442632-42: (8*4)+(7*4)+(6*2)+(5*6)+(4*3)+(3*2)+(2*4)+(1*2)=130 130 % 10 = 0 So 442632-42-0 is a valid CAS Registry Number.
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