The CAS Registry Mumber 778560-45-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,7,8,5,6 and 0 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 778560-45: (8*7)+(7*7)+(6*8)+(5*5)+(4*6)+(3*0)+(2*4)+(1*5)=215 215 % 10 = 5 So 778560-45-5 is a valid CAS Registry Number.
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