The CAS Registry Mumber 81844-75-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,4 and 4 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 81844-75: (7*8)+(6*1)+(5*8)+(4*4)+(3*4)+(2*7)+(1*5)=149 149 % 10 = 9 So 81844-75-9 is a valid CAS Registry Number.
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