The CAS Registry Mumber 17883-13-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,8,8 and 3 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 17883-13: (7*1)+(6*7)+(5*8)+(4*8)+(3*3)+(2*1)+(1*3)=135 135 % 10 = 5 So 17883-13-5 is a valid CAS Registry Number.
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