The CAS Registry Mumber 251089-69-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,1,0,8 and 9 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 251089-69: (8*2)+(7*5)+(6*1)+(5*0)+(4*8)+(3*9)+(2*6)+(1*9)=137 137 % 10 = 7 So 251089-69-7 is a valid CAS Registry Number.
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