The CAS Registry Mumber 202340-92-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,2,3,4 and 0 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 202340-92: (8*2)+(7*0)+(6*2)+(5*3)+(4*4)+(3*0)+(2*9)+(1*2)=79 79 % 10 = 9 So 202340-92-9 is a valid CAS Registry Number.
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