The CAS Registry Mumber 400073-91-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,0,0,7 and 3 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 400073-91: (8*4)+(7*0)+(6*0)+(5*0)+(4*7)+(3*3)+(2*9)+(1*1)=88 88 % 10 = 8 So 400073-91-8 is a valid CAS Registry Number.
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