The CAS Registry Mumber 103170-24-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,1,7 and 0 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 103170-24: (8*1)+(7*0)+(6*3)+(5*1)+(4*7)+(3*0)+(2*2)+(1*4)=67 67 % 10 = 7 So 103170-24-7 is a valid CAS Registry Number.
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