The CAS Registry Mumber 2777-51-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,7,7 and 7 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 2777-51: (6*2)+(5*7)+(4*7)+(3*7)+(2*5)+(1*1)=107 107 % 10 = 7 So 2777-51-7 is a valid CAS Registry Number.
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