The CAS Registry Mumber 17663-42-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,6,6 and 3 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 17663-42: (7*1)+(6*7)+(5*6)+(4*6)+(3*3)+(2*4)+(1*2)=122 122 % 10 = 2 So 17663-42-2 is a valid CAS Registry Number.
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