The CAS Registry Mumber 27799-55-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,7,9 and 9 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 27799-55: (7*2)+(6*7)+(5*7)+(4*9)+(3*9)+(2*5)+(1*5)=169 169 % 10 = 9 So 27799-55-9 is a valid CAS Registry Number.
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