The CAS Registry Mumber 123450-38-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,4,5 and 0 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 123450-38: (8*1)+(7*2)+(6*3)+(5*4)+(4*5)+(3*0)+(2*3)+(1*8)=94 94 % 10 = 4 So 123450-38-4 is a valid CAS Registry Number.
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