The CAS Registry Mumber 21246-63-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,2,4 and 6 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 21246-63: (7*2)+(6*1)+(5*2)+(4*4)+(3*6)+(2*6)+(1*3)=79 79 % 10 = 9 So 21246-63-9 is a valid CAS Registry Number.
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