The CAS Registry Mumber 77573-25-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,5,7 and 3 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 77573-25: (7*7)+(6*7)+(5*5)+(4*7)+(3*3)+(2*2)+(1*5)=162 162 % 10 = 2 So 77573-25-2 is a valid CAS Registry Number.
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