The CAS Registry Mumber 20746-25-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,7,4 and 6 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 20746-25: (7*2)+(6*0)+(5*7)+(4*4)+(3*6)+(2*2)+(1*5)=92 92 % 10 = 2 So 20746-25-2 is a valid CAS Registry Number.
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