The CAS Registry Mumber 5142-52-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,1,4 and 2 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 5142-52: (6*5)+(5*1)+(4*4)+(3*2)+(2*5)+(1*2)=69 69 % 10 = 9 So 5142-52-9 is a valid CAS Registry Number.
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