The CAS Registry Mumber 120002-56-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,0,0 and 2 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 120002-56: (8*1)+(7*2)+(6*0)+(5*0)+(4*0)+(3*2)+(2*5)+(1*6)=44 44 % 10 = 4 So 120002-56-4 is a valid CAS Registry Number.
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