The CAS Registry Mumber 50300-54-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,0,3,0 and 0 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 50300-54: (7*5)+(6*0)+(5*3)+(4*0)+(3*0)+(2*5)+(1*4)=64 64 % 10 = 4 So 50300-54-4 is a valid CAS Registry Number.
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