The CAS Registry Mumber 65405-63-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,4,0 and 5 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 65405-63: (7*6)+(6*5)+(5*4)+(4*0)+(3*5)+(2*6)+(1*3)=122 122 % 10 = 2 So 65405-63-2 is a valid CAS Registry Number.
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