The CAS Registry Mumber 13261-78-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,2,6 and 1 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 13261-78: (7*1)+(6*3)+(5*2)+(4*6)+(3*1)+(2*7)+(1*8)=84 84 % 10 = 4 So 13261-78-4 is a valid CAS Registry Number.
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