The CAS Registry Mumber 17658-99-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,6,5 and 8 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 17658-99: (7*1)+(6*7)+(5*6)+(4*5)+(3*8)+(2*9)+(1*9)=150 150 % 10 = 0 So 17658-99-0 is a valid CAS Registry Number.
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