The CAS Registry Mumber 1160-90-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,1,6 and 0 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1160-90: (6*1)+(5*1)+(4*6)+(3*0)+(2*9)+(1*0)=53 53 % 10 = 3 So 1160-90-3 is a valid CAS Registry Number.
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