The CAS Registry Mumber 299442-86-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,9,9,4,4 and 2 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 299442-86: (8*2)+(7*9)+(6*9)+(5*4)+(4*4)+(3*2)+(2*8)+(1*6)=197 197 % 10 = 7 So 299442-86-7 is a valid CAS Registry Number.
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