The CAS Registry Mumber 939758-78-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,3,9,7,5 and 8 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 939758-78: (8*9)+(7*3)+(6*9)+(5*7)+(4*5)+(3*8)+(2*7)+(1*8)=248 248 % 10 = 8 So 939758-78-8 is a valid CAS Registry Number.
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