The CAS Registry Mumber 123155-24-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,1,5 and 5 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 123155-24: (8*1)+(7*2)+(6*3)+(5*1)+(4*5)+(3*5)+(2*2)+(1*4)=88 88 % 10 = 8 So 123155-24-8 is a valid CAS Registry Number.
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