The CAS Registry Mumber 101812-47-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,8,1 and 2 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 101812-47: (8*1)+(7*0)+(6*1)+(5*8)+(4*1)+(3*2)+(2*4)+(1*7)=79 79 % 10 = 9 So 101812-47-9 is a valid CAS Registry Number.
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