The CAS Registry Mumber 205110-78-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,5,1,1 and 0 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 205110-78: (8*2)+(7*0)+(6*5)+(5*1)+(4*1)+(3*0)+(2*7)+(1*8)=77 77 % 10 = 7 So 205110-78-7 is a valid CAS Registry Number.
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