The CAS Registry Mumber 68540-69-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,5,4 and 0 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 68540-69: (7*6)+(6*8)+(5*5)+(4*4)+(3*0)+(2*6)+(1*9)=152 152 % 10 = 2 So 68540-69-2 is a valid CAS Registry Number.
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