The CAS Registry Mumber 401812-91-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,1,8,1 and 2 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 401812-91: (8*4)+(7*0)+(6*1)+(5*8)+(4*1)+(3*2)+(2*9)+(1*1)=107 107 % 10 = 7 So 401812-91-7 is a valid CAS Registry Number.
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