The CAS Registry Mumber 9001-52-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 1 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 9001-52: (6*9)+(5*0)+(4*0)+(3*1)+(2*5)+(1*2)=69 69 % 10 = 9 So 9001-52-9 is a valid CAS Registry Number.
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