The CAS Registry Mumber 69784-34-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,7,8 and 4 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 69784-34: (7*6)+(6*9)+(5*7)+(4*8)+(3*4)+(2*3)+(1*4)=185 185 % 10 = 5 So 69784-34-5 is a valid CAS Registry Number.
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