The CAS Registry Mumber 105311-63-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,3,1 and 1 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 105311-63: (8*1)+(7*0)+(6*5)+(5*3)+(4*1)+(3*1)+(2*6)+(1*3)=75 75 % 10 = 5 So 105311-63-5 is a valid CAS Registry Number.
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