The CAS Registry Mumber 145234-87-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,5,2,3 and 4 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 145234-87: (8*1)+(7*4)+(6*5)+(5*2)+(4*3)+(3*4)+(2*8)+(1*7)=123 123 % 10 = 3 So 145234-87-3 is a valid CAS Registry Number.
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