The CAS Registry Mumber 242797-55-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,2,7,9 and 7 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 242797-55: (8*2)+(7*4)+(6*2)+(5*7)+(4*9)+(3*7)+(2*5)+(1*5)=163 163 % 10 = 3 So 242797-55-3 is a valid CAS Registry Number.
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