Question

2 coins are tossed. What is the probability of getting at least one head?

Answer 1

Step 1:

You will draw a tree diagram to illustrate the information.

Step 2:

The tree diagram shows the first and the second coin.

Next, write the formula for the probability.

`Probability\text{ of any event = }\frac{n\text{umber of required event}}{\text{sample space (Total possible outcomes)}}`

Step 3:

The sample space = {HH, HT , TH , TT} = 4

Event space = {HH , HT , TH} at least one head = 3

Step 4:

Substitute in the formula to find the probability of getting at least one head.

`=\text{ }(3)/(4)`

Final answer

The probability of getting at least one head

`\text{= }(3)/(4)`