The CAS Registry Mumber 56-77-9 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 5 and 6 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 56-77: (4*5)+(3*6)+(2*7)+(1*7)=59 59 % 10 = 9 So 56-77-9 is a valid CAS Registry Number.
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