The CAS Registry Mumber 136759-84-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,7,5 and 9 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 136759-84: (8*1)+(7*3)+(6*6)+(5*7)+(4*5)+(3*9)+(2*8)+(1*4)=167 167 % 10 = 7 So 136759-84-7 is a valid CAS Registry Number.
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