You toss a fair coin 5 times. What is the probability of at least one head?

The probability of obtaining at least 1 head would be 31/32 there are 2^5 (32) different combinations of outcomes from 5 coin tosses. only 1 of these will be ALL TAILS so all other combinations contain AT LEAST 1 head so its 1 - 1/32 = 31/32

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