The CAS Registry Mumber 71631-40-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,6,3 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 71631-40: (7*7)+(6*1)+(5*6)+(4*3)+(3*1)+(2*4)+(1*0)=108 108 % 10 = 8 So 71631-40-8 is a valid CAS Registry Number.
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