The CAS Registry Mumber 1301717-84-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,0,1,7,1 and 7 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 1301717-84: (9*1)+(8*3)+(7*0)+(6*1)+(5*7)+(4*1)+(3*7)+(2*8)+(1*4)=119 119 % 10 = 9 So 1301717-84-9 is a valid CAS Registry Number.
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