The CAS Registry Mumber 75422-21-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,4,2 and 2 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 75422-21: (7*7)+(6*5)+(5*4)+(4*2)+(3*2)+(2*2)+(1*1)=118 118 % 10 = 8 So 75422-21-8 is a valid CAS Registry Number.
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