The CAS Registry Mumber 951884-21-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,5,1,8,8 and 4 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 951884-21: (8*9)+(7*5)+(6*1)+(5*8)+(4*8)+(3*4)+(2*2)+(1*1)=202 202 % 10 = 2 So 951884-21-2 is a valid CAS Registry Number.
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