The CAS Registry Mumber 210755-31-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,0,7,5 and 5 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 210755-31: (8*2)+(7*1)+(6*0)+(5*7)+(4*5)+(3*5)+(2*3)+(1*1)=100 100 % 10 = 0 So 210755-31-0 is a valid CAS Registry Number.
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