The CAS Registry Mumber 54915-50-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,9,1 and 5 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 54915-50: (7*5)+(6*4)+(5*9)+(4*1)+(3*5)+(2*5)+(1*0)=133 133 % 10 = 3 So 54915-50-3 is a valid CAS Registry Number.
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