The CAS Registry Mumber 7224-02-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,2,2 and 4 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 7224-02: (6*7)+(5*2)+(4*2)+(3*4)+(2*0)+(1*2)=74 74 % 10 = 4 So 7224-02-4 is a valid CAS Registry Number.
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