The CAS Registry Mumber 18532-31-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,5,3 and 2 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 18532-31: (7*1)+(6*8)+(5*5)+(4*3)+(3*2)+(2*3)+(1*1)=105 105 % 10 = 5 So 18532-31-5 is a valid CAS Registry Number.
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