The CAS Registry Mumber 41705-03-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,1,7,0 and 5 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 41705-03: (7*4)+(6*1)+(5*7)+(4*0)+(3*5)+(2*0)+(1*3)=87 87 % 10 = 7 So 41705-03-7 is a valid CAS Registry Number.
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