The CAS Registry Mumber 1057749-27-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,5,7,7,4 and 9 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1057749-27: (9*1)+(8*0)+(7*5)+(6*7)+(5*7)+(4*4)+(3*9)+(2*2)+(1*7)=175 175 % 10 = 5 So 1057749-27-5 is a valid CAS Registry Number.
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