The CAS Registry Mumber 284493-70-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,4,4,9 and 3 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 284493-70: (8*2)+(7*8)+(6*4)+(5*4)+(4*9)+(3*3)+(2*7)+(1*0)=175 175 % 10 = 5 So 284493-70-5 is a valid CAS Registry Number.
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