The CAS Registry Mumber 81295-20-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,2,9 and 5 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 81295-20: (7*8)+(6*1)+(5*2)+(4*9)+(3*5)+(2*2)+(1*0)=127 127 % 10 = 7 So 81295-20-7 is a valid CAS Registry Number.
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