The CAS Registry Mumber 51424-89-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,4,2 and 4 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 51424-89: (7*5)+(6*1)+(5*4)+(4*2)+(3*4)+(2*8)+(1*9)=106 106 % 10 = 6 So 51424-89-6 is a valid CAS Registry Number.
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