The CAS Registry Mumber 31025-59-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,0,2 and 5 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 31025-59: (7*3)+(6*1)+(5*0)+(4*2)+(3*5)+(2*5)+(1*9)=69 69 % 10 = 9 So 31025-59-9 is a valid CAS Registry Number.
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