The CAS Registry Mumber 69956-68-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,9,5 and 6 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 69956-68: (7*6)+(6*9)+(5*9)+(4*5)+(3*6)+(2*6)+(1*8)=199 199 % 10 = 9 So 69956-68-9 is a valid CAS Registry Number.
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