The CAS Registry Mumber 1378389-28-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,7,8,3,8 and 9 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1378389-28: (9*1)+(8*3)+(7*7)+(6*8)+(5*3)+(4*8)+(3*9)+(2*2)+(1*8)=216 216 % 10 = 6 So 1378389-28-6 is a valid CAS Registry Number.
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