Question: a) Each school in a certain district was asked to design a logo for their school using only the colours red, white, green, yellow, black,

a) Each school in a certain district was asked to design a logo for their school using only the colours red, white, green, yellow, black, and blue. How many different two-colour combinations of logos are possible?

b)Find the numerical coefficient of the term x^-3 for the expansion of ((x+1)/2x)9

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