The CAS Registry Mumber 53317-24-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,3,1 and 7 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 53317-24: (7*5)+(6*3)+(5*3)+(4*1)+(3*7)+(2*2)+(1*4)=101 101 % 10 = 1 So 53317-24-1 is a valid CAS Registry Number.
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