The CAS Registry Mumber 3429-55-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,4,2 and 9 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 3429-55: (6*3)+(5*4)+(4*2)+(3*9)+(2*5)+(1*5)=88 88 % 10 = 8 So 3429-55-8 is a valid CAS Registry Number.
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