The CAS Registry Mumber 31886-11-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,8,8 and 6 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 31886-11: (7*3)+(6*1)+(5*8)+(4*8)+(3*6)+(2*1)+(1*1)=120 120 % 10 = 0 So 31886-11-0 is a valid CAS Registry Number.
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