The CAS Registry Mumber 78734-69-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,7,3 and 4 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 78734-69: (7*7)+(6*8)+(5*7)+(4*3)+(3*4)+(2*6)+(1*9)=177 177 % 10 = 7 So 78734-69-7 is a valid CAS Registry Number.
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