The CAS Registry Mumber 901-88-2 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,0 and 1 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 901-88: (5*9)+(4*0)+(3*1)+(2*8)+(1*8)=72 72 % 10 = 2 So 901-88-2 is a valid CAS Registry Number.
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