A coin is tossed successively three times. The probability of getting exactly one head or two heads is.
Explanation for the correct answer:
Step 1: Find the probability of getting head and getting tail.
We have been given that, a coin is tossed three times.
We need to find the probability of getting exactly one head or two heads.
Let represents the probability of getting head and represents the probability of getting tail.
and
Step 2: Using the formula for the binomial distribution, find the required probability.
The probability of getting exactly one head or two heads is,
This means, the probability of getting exactly one head or two heads is .
Therefore, option (C) is the correct answer.