The CAS Registry Mumber 78693-88-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,6,9 and 3 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 78693-88: (7*7)+(6*8)+(5*6)+(4*9)+(3*3)+(2*8)+(1*8)=196 196 % 10 = 6 So 78693-88-6 is a valid CAS Registry Number.
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