Math - Probability 101

In this lecture we look at how to calculate the probability of “mutually exclusive” events.

For your challenge, you were asked to find the probability of drawing either a heart or a face card from a standard deck of 52 playing cards.

Share your answers below and remember to use spoiler tags!

Here’s my answer for the challenge

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Great work @valyfox!

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  1. there are 13 hearts => 13/52
  2. there are 12 face cards (3 cards per suit times 4 suits) => 12/52
  3. 3 face cards are also hearts (13/52 * 12/52 = 3/52)

P(A|B) = P(A) + P(B) - P(A&B)
P(A|B) = (13/52 + 12/52) - 3/52
P(A|B) = 25/52 - 3/52
P(A|B) = 22/52 = 11/26

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here is mine: