The CAS Registry Mumber 75818-72-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,8,1 and 8 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 75818-72: (7*7)+(6*5)+(5*8)+(4*1)+(3*8)+(2*7)+(1*2)=163 163 % 10 = 3 So 75818-72-3 is a valid CAS Registry Number.
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