There are four playing cards, all spades, and the numbers are 1, 2, 3, 10 respectively. If two cards are randomly selected, the probability that the sum of numbers is greater than the average is _ _ _

There are four playing cards, all spades, and the numbers are 1, 2, 3, 10 respectively. If two cards are randomly selected, the probability that the sum of numbers is greater than the average is _ _ _ _. Draw a tree:

∫ * * There are 12 possible results,

The average value is 1+2+3+ 104=4,

In eight cases, the sum of the numbers is greater than the average.

The probability that the sum of numbers is greater than the average is 8 12 = 23.

So the answer is: 23.