The CAS Registry Mumber 3368-89-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,3,6 and 8 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 3368-89: (6*3)+(5*3)+(4*6)+(3*8)+(2*8)+(1*9)=106 106 % 10 = 6 So 3368-89-6 is a valid CAS Registry Number.
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