The CAS Registry Mumber 742017-26-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,4,2,0,1 and 7 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 742017-26: (8*7)+(7*4)+(6*2)+(5*0)+(4*1)+(3*7)+(2*2)+(1*6)=131 131 % 10 = 1 So 742017-26-1 is a valid CAS Registry Number.
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