The CAS Registry Mumber 1241986-40-2 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,1,9,8 and 6 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1241986-40: (9*1)+(8*2)+(7*4)+(6*1)+(5*9)+(4*8)+(3*6)+(2*4)+(1*0)=162 162 % 10 = 2 So 1241986-40-2 is a valid CAS Registry Number.
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