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.

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

Step-by-step 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

2/11

Step-by-step 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

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after simplifying it i got: -36.25 as my answer. hope that !