The CAS Registry Mumber 744250-80-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,4,4,2,5 and 0 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 744250-80: (8*7)+(7*4)+(6*4)+(5*2)+(4*5)+(3*0)+(2*8)+(1*0)=154 154 % 10 = 4 So 744250-80-4 is a valid CAS Registry Number.
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