The CAS Registry Mumber 7234-63-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,2,3 and 4 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 7234-63: (6*7)+(5*2)+(4*3)+(3*4)+(2*6)+(1*3)=91 91 % 10 = 1 So 7234-63-1 is a valid CAS Registry Number.
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