The CAS Registry Mumber 23-15-4 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 2 and 3 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 23-15: (4*2)+(3*3)+(2*1)+(1*5)=24 24 % 10 = 4 So 23-15-4 is a valid CAS Registry Number.
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