The CAS Registry Mumber 1255918-45-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,5,5,9,1 and 8 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 1255918-45: (9*1)+(8*2)+(7*5)+(6*5)+(5*9)+(4*1)+(3*8)+(2*4)+(1*5)=176 176 % 10 = 6 So 1255918-45-6 is a valid CAS Registry Number.
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