The CAS Registry Mumber 97649-05-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,6,4 and 9 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 97649-05: (7*9)+(6*7)+(5*6)+(4*4)+(3*9)+(2*0)+(1*5)=183 183 % 10 = 3 So 97649-05-3 is a valid CAS Registry Number.
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