Question

Emma has 7 pens in a box. 5 of the pens are blue. 2 of the pens are red. emma takes at random a pen from the box and writes down its colour. emma puts the pen back in the box. then emma takes at random a second pen from the box, and writes down its colour.

Answer 1

There is no question stated. If one assume the question is "Does the probability of picking the same color pen change after the first try?," the answer is "No."

Explanation:

When the pen is replaced, the probability reverts back to the original value:

There are 7 pens:

5 Blue

2 Red

The probability of picking a red or blue pen on the first try is:

Red = 2/7

Blue = 5/7

When the pen is replaced, the probabilities return to the original values.