# Probability Stage 4 - Short Problems

This is part of our collection of Short Problems.

You may also be interested in our longer problems on Probability - Stage 4.

Printable worksheets containing selections of these problems are available here:

 Stage 4 ★★ Sheet 1 Solutions

### Flipping Coins

##### KS 4 Short Challenge Level:

A coin is flipped 4 times. What is the probability of getting heads at least 3 times?

### Swapping Sweets

##### KS 4 Short Challenge Level:

If two girls each take a sweet from each other's bags, what is the probability that they end up with what they started with?

### XOXOXO

##### KS 4 Short Challenge Level:

6 tiles are placed in a row. What is the probability that no two adjacent tiles have the same letter on them?

### CD Collection

##### KS 4 Short Challenge Level:

How many different ways can I arrange the CDs in my collection?

### Two Girls

##### KS 4 Short Challenge Level:

There are 10 girls in a mixed class. If two pupils are selected, the probability that they are both girls is 0.15. How many boys are in the class?

### Pieces of Eight

##### KS 4 Short Challenge Level:

Two of the triangles in the diagram are shaded black. What is the probability the resulting figure has at least one axis of symmetry?

### Domino Match

##### KS 4 Short Challenge Level:

If you take two dominoes from a set at random, what is the probability that they 'match'?

### Descending Deal

##### KS 4 Short Challenge Level:

Four cards from a set numbered 1-36 are dealt. What is the probability that they are dealt in order?

### Face Order

##### KS 4 Short Challenge Level:

How many ways can these five faces be ordered?