The CAS Registry Mumber 150841-09-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,8,4 and 1 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 150841-09: (8*1)+(7*5)+(6*0)+(5*8)+(4*4)+(3*1)+(2*0)+(1*9)=111 111 % 10 = 1 So 150841-09-1 is a valid CAS Registry Number.
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