The CAS Registry Mumber 17603-79-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,6,0 and 3 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 17603-79: (7*1)+(6*7)+(5*6)+(4*0)+(3*3)+(2*7)+(1*9)=111 111 % 10 = 1 So 17603-79-1 is a valid CAS Registry Number.
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