The CAS Registry Mumber 55105-52-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,1,0 and 5 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 55105-52: (7*5)+(6*5)+(5*1)+(4*0)+(3*5)+(2*5)+(1*2)=97 97 % 10 = 7 So 55105-52-7 is a valid CAS Registry Number.
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