The CAS Registry Mumber 210-26-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,1 and 0 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 210-26: (5*2)+(4*1)+(3*0)+(2*2)+(1*6)=24 24 % 10 = 4 So 210-26-4 is a valid CAS Registry Number.
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