The CAS Registry Mumber 10203-50-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,2,0 and 3 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 10203-50: (7*1)+(6*0)+(5*2)+(4*0)+(3*3)+(2*5)+(1*0)=36 36 % 10 = 6 So 10203-50-6 is a valid CAS Registry Number.
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