The CAS Registry Mumber 1219097-42-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,1,9,0,9 and 7 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1219097-42: (9*1)+(8*2)+(7*1)+(6*9)+(5*0)+(4*9)+(3*7)+(2*4)+(1*2)=153 153 % 10 = 3 So 1219097-42-3 is a valid CAS Registry Number.
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