The CAS Registry Mumber 109125-51-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,1,2 and 5 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 109125-51: (8*1)+(7*0)+(6*9)+(5*1)+(4*2)+(3*5)+(2*5)+(1*1)=101 101 % 10 = 1 So 109125-51-1 is a valid CAS Registry Number.
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