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Probability of picking multiple shapes from one bag

This math skill teaches how to calculate the probability of drawing two specific items in sequence from a bag without replacement. It emphasizes the change in sample space after the first draw and demonstrates how to multiply probabilities for consecutive events.

Learn probability of picking multiple shapes from one bag

Teaching Transcript

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What is the chance of picking two red triangles in a row?

For our first pick, it's a 3 out of 5 chance.

But for our second pick we've got to notice that we've now removed a red triangle

So, our chance is now 2 out of 4.

Both picks need to happen to pick 2 in a row, so our probability is 3 over 5, times 2 over 4. Which simplifies to 0.3 or 30%.

Skill Practice

Probability of picking multiple shapes from one bag

Test your understanding of probability of picking multiple shapes from one bag by practicing it! Work through the below exercises to use it in practice.