How many cards can you take out at a time? Make sure that at least two cards are of the same suit.

There are 54 cards in a playing card * * *. At least 16 cards should be drawn to ensure that at least two of them have the same number of points.

According to the pigeon hole principle, the points are 1(A), 2, 3, 4, 5, 6, 7, 8, 9, 10,1(j), 12(Q). If you take 1 at will, its points must be one of 1- 13, then there are two pieces with the same points, so at least take 16.

Extended data:

If nm+ 1 element is divided into n sets (A 1, A2, ..., An) and a 1, a2, ..., an are used to represent the corresponding number of elements contained in these n sets, then there is at least one set Ai, and the number of elements contained therein is greater than or equal to m+/kloc.

The elements of Q 1+Q2+…+QN-N+ 1 are divided into n sets a 1, A2, …, An, and A 1, a2, …, an is used to represent the corresponding number of elements in the n sets, and there is at least one i, so that.

Divide an infinite number of elements into a finite set, assuming that the number of elements in this finite set is limited, then the number obtained by adding the finite elements must be limited.