The CAS Registry Mumber 69841-30-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,8,4 and 1 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 69841-30: (7*6)+(6*9)+(5*8)+(4*4)+(3*1)+(2*3)+(1*0)=161 161 % 10 = 1 So 69841-30-1 is a valid CAS Registry Number.
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