The CAS Registry Mumber 1238-60-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,3 and 8 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1238-60: (6*1)+(5*2)+(4*3)+(3*8)+(2*6)+(1*0)=64 64 % 10 = 4 So 1238-60-4 is a valid CAS Registry Number.
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