The CAS Registry Mumber 10368-20-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,3,6 and 8 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 10368-20: (7*1)+(6*0)+(5*3)+(4*6)+(3*8)+(2*2)+(1*0)=74 74 % 10 = 4 So 10368-20-4 is a valid CAS Registry Number.
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