The CAS Registry Mumber 1029773-20-3 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,9,7,7 and 3 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1029773-20: (9*1)+(8*0)+(7*2)+(6*9)+(5*7)+(4*7)+(3*3)+(2*2)+(1*0)=153 153 % 10 = 3 So 1029773-20-3 is a valid CAS Registry Number.
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