Question

p(blue)=\frac{total number of squares}{number of blue squares}
p(blue)=\frac{number of blue squares}{total number of squares}
p(blue)=\frac{number of blue squares}{number of white squares}
p(blue)=\frac{number of white squares}{number of blue squares}

Explanation:

Step1: Recall probability formula

The probability of an event is the number of favorable outcomes divided by the total number of possible outcomes. In the context of the colored - squares problem, the event is selecting a blue square. The favorable outcomes are the blue squares, and the total possible outcomes are all the squares.

Step2: Identify the correct ratio

The probability of selecting a blue square, $P(\text{blue})$, is given by the ratio of the number of blue squares to the total number of squares.

Answer:

P(blue)=$\frac{\text{number of blue squares}}{\text{total number of squares}}$ (the second option)