Question: I will upvote or downvote immediately (e) What is the coefficient of x3y5z in the expansion of (x+2y+z)9 ? (f) How many walks of length

I will upvote or downvote immediately
(e) What is the coefficient of x3y5z in the expansion of (x+2y+z)9 ? (f) How many walks of length 4 are there in the complete bipartite graph K30,40 ? (g) Up to isomorphism, draw all graphs on 5 vertices with 3 edges
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