We know that the total # of combinations -> 150
We know the number of chair combinations -> 5C2 =>10
So inorder for the total combination to be 150, the number of table combination has to be 15
Two tables have to be selected from X number of tables.
XC2 = 15 => x(x-1)/2 =15 => x(x-1) = 30
From here we can find that X = 6.
So,
6C2 => 6*5/1*2 = 15
So in total, 10*15 = 150 combinations.
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