The CAS Registry Mumber 297730-05-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,9,7,7,3 and 0 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 297730-05: (8*2)+(7*9)+(6*7)+(5*7)+(4*3)+(3*0)+(2*0)+(1*5)=173 173 % 10 = 3 So 297730-05-3 is a valid CAS Registry Number.
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