Question

There are 11 pens in a box.

8 are black and 3 are red.
Two pens are taken out at random without replacement.
Work out the probability that the two pens are the same colour.

Answer 1

2/11

Explanation:

it becuase when u take 2 pens of the same color you have the 11 pens in total and when u take 2 pens you do the answer over 11 and simplfy if needed

Answer 2

0.563 chance that 2 pens of the same color are chosen.

Explanation:

8/11 - amount of original black pens multiplied by

7/10 - black oens left in box +

3/11 -overall amount of red pens - multiplied by

2/10 - pens left in box