The CAS Registry Mumber 142636-31-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,6,3 and 6 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 142636-31: (8*1)+(7*4)+(6*2)+(5*6)+(4*3)+(3*6)+(2*3)+(1*1)=115 115 % 10 = 5 So 142636-31-5 is a valid CAS Registry Number.
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