The CAS Registry Mumber 1198108-42-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,9,8,1,0 and 8 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1198108-42: (9*1)+(8*1)+(7*9)+(6*8)+(5*1)+(4*0)+(3*8)+(2*4)+(1*2)=167 167 % 10 = 7 So 1198108-42-7 is a valid CAS Registry Number.
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