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Check Digit Verification of cas no

The CAS Registry Mumber 1186015-80-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,8,6,0,1 and 5 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1186015-80:
(9*1)+(8*1)+(7*8)+(6*6)+(5*0)+(4*1)+(3*5)+(2*8)+(1*0)=144
144 % 10 = 4
So 1186015-80-4 is a valid CAS Registry Number.
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