The CAS Registry Mumber 87321-88-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,3,2 and 1 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 87321-88: (7*8)+(6*7)+(5*3)+(4*2)+(3*1)+(2*8)+(1*8)=148 148 % 10 = 8 So 87321-88-8 is a valid CAS Registry Number.
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