The CAS Registry Mumber 1779-72-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,7,7 and 9 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 1779-72: (6*1)+(5*7)+(4*7)+(3*9)+(2*7)+(1*2)=112 112 % 10 = 2 So 1779-72-2 is a valid CAS Registry Number.
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