The CAS Registry Mumber 4079-31-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,0,7 and 9 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 4079-31: (6*4)+(5*0)+(4*7)+(3*9)+(2*3)+(1*1)=86 86 % 10 = 6 So 4079-31-6 is a valid CAS Registry Number.
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