The CAS Registry Mumber 90028-44-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,0,2 and 8 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 90028-44: (7*9)+(6*0)+(5*0)+(4*2)+(3*8)+(2*4)+(1*4)=107 107 % 10 = 7 So 90028-44-7 is a valid CAS Registry Number.
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