The CAS Registry Mumber 87530-82-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,5,3 and 0 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 87530-82: (7*8)+(6*7)+(5*5)+(4*3)+(3*0)+(2*8)+(1*2)=153 153 % 10 = 3 So 87530-82-3 is a valid CAS Registry Number.
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