The CAS Registry Mumber 127718-25-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,7,7,1 and 8 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 127718-25: (8*1)+(7*2)+(6*7)+(5*7)+(4*1)+(3*8)+(2*2)+(1*5)=136 136 % 10 = 6 So 127718-25-6 is a valid CAS Registry Number.
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