The CAS Registry Mumber 299975-19-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,9,9,9,7 and 5 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 299975-19: (8*2)+(7*9)+(6*9)+(5*9)+(4*7)+(3*5)+(2*1)+(1*9)=232 232 % 10 = 2 So 299975-19-2 is a valid CAS Registry Number.
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