The CAS Registry Mumber 103538-55-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,5,3 and 8 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 103538-55: (8*1)+(7*0)+(6*3)+(5*5)+(4*3)+(3*8)+(2*5)+(1*5)=102 102 % 10 = 2 So 103538-55-2 is a valid CAS Registry Number.
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