The CAS Registry Mumber 113717-54-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,7,1 and 7 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 113717-54: (8*1)+(7*1)+(6*3)+(5*7)+(4*1)+(3*7)+(2*5)+(1*4)=107 107 % 10 = 7 So 113717-54-7 is a valid CAS Registry Number.
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