The CAS Registry Mumber 189265-49-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,2,6 and 5 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 189265-49: (8*1)+(7*8)+(6*9)+(5*2)+(4*6)+(3*5)+(2*4)+(1*9)=184 184 % 10 = 4 So 189265-49-4 is a valid CAS Registry Number.
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