The CAS Registry Mumber 57765-02-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,7,6 and 5 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 57765-02: (7*5)+(6*7)+(5*7)+(4*6)+(3*5)+(2*0)+(1*2)=153 153 % 10 = 3 So 57765-02-3 is a valid CAS Registry Number.
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