The CAS Registry Mumber 4904-05-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,0 and 4 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 4904-05: (6*4)+(5*9)+(4*0)+(3*4)+(2*0)+(1*5)=86 86 % 10 = 6 So 4904-05-6 is a valid CAS Registry Number.
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