The CAS Registry Mumber 6871-40-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,8,7 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 6871-40: (6*6)+(5*8)+(4*7)+(3*1)+(2*4)+(1*0)=115 115 % 10 = 5 So 6871-40-5 is a valid CAS Registry Number.
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