The CAS Registry Mumber 71305-81-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,3,0 and 5 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 71305-81: (7*7)+(6*1)+(5*3)+(4*0)+(3*5)+(2*8)+(1*1)=102 102 % 10 = 2 So 71305-81-2 is a valid CAS Registry Number.
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