The CAS Registry Mumber 250346-57-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,0,3,4 and 6 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 250346-57: (8*2)+(7*5)+(6*0)+(5*3)+(4*4)+(3*6)+(2*5)+(1*7)=117 117 % 10 = 7 So 250346-57-7 is a valid CAS Registry Number.
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