The CAS Registry Mumber 1027938-85-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,7,9,3 and 8 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 1027938-85: (9*1)+(8*0)+(7*2)+(6*7)+(5*9)+(4*3)+(3*8)+(2*8)+(1*5)=167 167 % 10 = 7 So 1027938-85-7 is a valid CAS Registry Number.
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