The CAS Registry Mumber 265-17-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,6 and 5 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 265-17: (5*2)+(4*6)+(3*5)+(2*1)+(1*7)=58 58 % 10 = 8 So 265-17-8 is a valid CAS Registry Number.
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