The CAS Registry Mumber 1337880-69-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,3,7,8,8 and 0 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 1337880-69: (9*1)+(8*3)+(7*3)+(6*7)+(5*8)+(4*8)+(3*0)+(2*6)+(1*9)=189 189 % 10 = 9 So 1337880-69-9 is a valid CAS Registry Number.
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