The CAS Registry Mumber 2631-30-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,6,3 and 1 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 2631-30: (6*2)+(5*6)+(4*3)+(3*1)+(2*3)+(1*0)=63 63 % 10 = 3 So 2631-30-3 is a valid CAS Registry Number.
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