The CAS Registry Mumber 116278-51-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,6,2,7 and 8 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 116278-51: (8*1)+(7*1)+(6*6)+(5*2)+(4*7)+(3*8)+(2*5)+(1*1)=124 124 % 10 = 4 So 116278-51-4 is a valid CAS Registry Number.
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