The CAS Registry Mumber 123150-12-9 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 0 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 123150-12: (8*1)+(7*2)+(6*3)+(5*1)+(4*5)+(3*0)+(2*1)+(1*2)=69 69 % 10 = 9 So 123150-12-9 is a valid CAS Registry Number.
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