How many black socks are there in a drawer?

A drawer contains 5 black socks and 3 white socks. If two socks were picked at random, what is the probability of getting a matching pair? If four socks were picked at random, what is the probability that only one of them is white? A drawer contains 5 black socks and 3 white socks.

What is the probability of 2 white socks in a draw?

So the chance of 2 whites is 7 11 × 6 10 which is 42 110 The chance of picking two equal socks is the sum of these probabilities, that is: 54 110 Originally Answered: There are 7 white socks and 4 black socks in a draw. What is the probability that 2 socks are the same colour if pulled out at random?

Why can’t we draw socks with more than 3 colors?

Since there simply are not more than 3 colors and we already have socks of all 3 colors. So the next drawn sock must match one of the colors. And you need to find the amount ofn socks you need topull out until you have at least 2 socks of 1 category. You draw 3 times, you get 1 siock of each color.

How many ways can you match socks?

You can select 2 of the 11 socks in the drawer in 11 x 10 / 2 = 55 ways. You can select 2 of the 7 white socks in 7 x 6 / 2 = 21 ways. You can select 2 of the 4 black socks in 4 x 3 / 2 = 6 ways. So 21 + 6 = 27 of the 55 combinations match colors, so 27 / 55.

How do you know if two socks are black or white?

If the first sock is black, the second one could be black, in which case you have a matching pair. If the second sock is white, the third sock will be either black and match the first sock, or white and match the second sock.

How many pairs of socks should you have in a pair?

If the first sock is black, the second one could be black, in which case you have a matching pair. If the second sock is white, the third sock will be either black and match the first sock, or white and match the second sock. Only three.