The CAS Registry Mumber 31340-33-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,3,4 and 0 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 31340-33: (7*3)+(6*1)+(5*3)+(4*4)+(3*0)+(2*3)+(1*3)=67 67 % 10 = 7 So 31340-33-7 is a valid CAS Registry Number.
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