The CAS Registry Mumber 112400-78-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,4,0 and 0 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 112400-78: (8*1)+(7*1)+(6*2)+(5*4)+(4*0)+(3*0)+(2*7)+(1*8)=69 69 % 10 = 9 So 112400-78-9 is a valid CAS Registry Number.
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