The CAS Registry Mumber 104303-50-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,4,3,0 and 3 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 104303-50: (8*1)+(7*0)+(6*4)+(5*3)+(4*0)+(3*3)+(2*5)+(1*0)=66 66 % 10 = 6 So 104303-50-6 is a valid CAS Registry Number.
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