The CAS Registry Mumber 142763-15-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,7,6 and 3 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 142763-15: (8*1)+(7*4)+(6*2)+(5*7)+(4*6)+(3*3)+(2*1)+(1*5)=123 123 % 10 = 3 So 142763-15-3 is a valid CAS Registry Number.
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