If the number of people is n, we can know from the meaning of the question: ①n-2 is a multiple of 3; ②n-4 is a multiple of 5; ③n-6 is a multiple of 7; ④n-8 is a multiple of 9; ⑤n is a multiple of 1 1, and n≥ 1 1.

② The single digit of the obtained n can only be 4 or 9.

Let the number of tables be x, and the number of x digits can only be 4 or 9.

11x = n nPossibility =44+ 1 1*(x-4) or 99+1* (x-9).

In the above formula, 1 1*(x-4) and1* (x-9) can be regarded as positive integer multiples of 1 10, because x is subtracted from the corresponding single digits.

1 10 can't meet the requirements of 1234⑤ at the same time, only 44 can meet the requirements by bringing them in.