matrix

from left to right

, numbered from top to bottom as 1, 2, 3, 4, 5, 6, 7, 8, 9.

1, let a = {circle throws into the box} and b = {circle throws out the box}

pay attention to

P(A)+

p(B)= 1

1

P(A)，

P(B) is set by itself or estimated by test frequency.

2. Let C=

{point j in the trap}, J= 1, 2, 3, 4, 5, 6, 7, 8, 9.

pay attention to

∑ p (c) < 1, because a circle falling into a square does not necessarily trap the article.

The values of P(C) and j, that is, the values related to the position of the article, should be the largest.

The size of P(C) can be estimated by experiments, or it can be

theory

Set one,

With people

Distance is related to angle.