The CAS Registry Mumber 77856-44-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,8,5 and 6 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 77856-44: (7*7)+(6*7)+(5*8)+(4*5)+(3*6)+(2*4)+(1*4)=181 181 % 10 = 1 So 77856-44-1 is a valid CAS Registry Number.
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