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The CAS Registry Mumber 18410-62-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,4,1 and 0 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 18410-62: (7*1)+(6*8)+(5*4)+(4*1)+(3*0)+(2*6)+(1*2)=93 93 % 10 = 3 So 18410-62-3 is a valid CAS Registry Number.