The CAS Registry Mumber 25852-38-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,8,5 and 2 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 25852-38: (7*2)+(6*5)+(5*8)+(4*5)+(3*2)+(2*3)+(1*8)=124 124 % 10 = 4 So 25852-38-4 is a valid CAS Registry Number.
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