The CAS Registry Mumber 119142-71-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,1,4 and 2 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 119142-71: (8*1)+(7*1)+(6*9)+(5*1)+(4*4)+(3*2)+(2*7)+(1*1)=111 111 % 10 = 1 So 119142-71-1 is a valid CAS Registry Number.
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