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What is the probability that at least one head will show up if a two-sided coin is flipped three times?



A. 1/8
B. 3/8
C. 1/2
D. 2/3
E. 7/8

This question is part of SAT Math Questions
Asked by Wyatt Williams, Last updated: Dec 18, 2019

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1 Answer

John Smith

John Smith

Answered Oct 14, 2016

7/8

The probability of one head showing up is equal to 1 - P(All tails), and the probability of all tails is (1/2)^3 = 1/8, so 1- 1/8 = 7/8
 1

TJSER

It's 1/2 okay?

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