The CAS Registry Mumber 920750-74-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,2,0,7,5 and 0 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 920750-74: (8*9)+(7*2)+(6*0)+(5*7)+(4*5)+(3*0)+(2*7)+(1*4)=159 159 % 10 = 9 So 920750-74-9 is a valid CAS Registry Number.
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