The CAS Registry Mumber 61189-93-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,1,1,8 and 9 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 61189-93: (7*6)+(6*1)+(5*1)+(4*8)+(3*9)+(2*9)+(1*3)=133 133 % 10 = 3 So 61189-93-3 is a valid CAS Registry Number.
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