The CAS Registry Mumber 25509-93-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,5,0 and 9 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 25509-93: (7*2)+(6*5)+(5*5)+(4*0)+(3*9)+(2*9)+(1*3)=117 117 % 10 = 7 So 25509-93-7 is a valid CAS Registry Number.
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