The CAS Registry Mumber 13988-27-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,9,8 and 8 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 13988-27: (7*1)+(6*3)+(5*9)+(4*8)+(3*8)+(2*2)+(1*7)=137 137 % 10 = 7 So 13988-27-7 is a valid CAS Registry Number.
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