The CAS Registry Mumber 142699-00-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,6,9 and 9 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 142699-00: (8*1)+(7*4)+(6*2)+(5*6)+(4*9)+(3*9)+(2*0)+(1*0)=141 141 % 10 = 1 So 142699-00-1 is a valid CAS Registry Number.
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