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In a line, in 6 ways. Around a table, in 2 ways.
What are two ways to make a trapezoid
Chair-#1 can seat any one of 7 people. For each of those . . .Chair-#2 can seat any one of the remaining 6 people. For each of those . . .Chair-#3 can seat any one of the remaining 5 people.Total number of ways to fill the 3 chairs = ( 7 x 6 x 5) = 210
there are 5 ways
293 ways