Solution to question is P(H) and P(H) and P(H) and P(H), which is 1/2 * 1/2 * 1/2 * 1/2 = 1/16 = 0.0625.
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Take your base chance of getting heads, 1/2, and raise it to the power of the number of times you flip the coin, 4.
(1/2)4 = 1/16 = .0625 = 6.25 %
If you toss them enough times, the probability is 1. For just one toss the probability is 1/4.
you toss 3 coins what is the probability that you get exactly 2 heads given that you get at least one head?
1/2 * 1/2 * 1/2 = 1/8 = 12.5%
The probability of heads is 1/2.
It is 0.00540 approx.