The CAS Registry Mumber 1161826-31-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,6,1,8,2 and 6 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1161826-31: (9*1)+(8*1)+(7*6)+(6*1)+(5*8)+(4*2)+(3*6)+(2*3)+(1*1)=138 138 % 10 = 8 So 1161826-31-8 is a valid CAS Registry Number.
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