The CAS Registry Mumber 2446-17-5 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,4,4 and 6 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 2446-17: (6*2)+(5*4)+(4*4)+(3*6)+(2*1)+(1*7)=75 75 % 10 = 5 So 2446-17-5 is a valid CAS Registry Number.
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