The CAS Registry Mumber 1260638-02-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,6,0,6,3 and 8 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1260638-02: (9*1)+(8*2)+(7*6)+(6*0)+(5*6)+(4*3)+(3*8)+(2*0)+(1*2)=135 135 % 10 = 5 So 1260638-02-5 is a valid CAS Registry Number.
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