The CAS Registry Mumber 50657-15-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,0,6,5 and 7 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 50657-15: (7*5)+(6*0)+(5*6)+(4*5)+(3*7)+(2*1)+(1*5)=113 113 % 10 = 3 So 50657-15-3 is a valid CAS Registry Number.
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