The CAS Registry Mumber 4635-27-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,6,3 and 5 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 4635-27: (6*4)+(5*6)+(4*3)+(3*5)+(2*2)+(1*7)=92 92 % 10 = 2 So 4635-27-2 is a valid CAS Registry Number.
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