The CAS Registry Mumber 775555-78-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,7,5,5,5 and 5 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 775555-78: (8*7)+(7*7)+(6*5)+(5*5)+(4*5)+(3*5)+(2*7)+(1*8)=217 217 % 10 = 7 So 775555-78-7 is a valid CAS Registry Number.
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