The CAS Registry Mumber 51852-20-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,8,5 and 2 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 51852-20: (7*5)+(6*1)+(5*8)+(4*5)+(3*2)+(2*2)+(1*0)=111 111 % 10 = 1 So 51852-20-1 is a valid CAS Registry Number.
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