AP BIOLOGY

HEREDITY

BASICS OF PROBABILITY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
You flip 3 coins. What is the probability that all three come up heads?
A
3/8
B
1/3
C
7/8
D
1/8
Explanation: 

Detailed explanation-1: -Answer: If you flip a coin 3 times the probability of getting 3 heads is 0.125. When you flip a coin 3 times, then all the possibe 8 outcomes are HHH, THH, HTH, HHT, TTH, THT, HTT, TTT. Explanation: Possible outcomes are HHH, THH, HTH, HHT, TTH, THT, HTT, TTT.

Detailed explanation-2: -What is the probability of getting all heads, when 3 coins are tossed simultaneously? When 3 coins are tossed, the favourable outcome is HHH. So required probability = 1/8.

Detailed explanation-3: -The probability of getting exactly 3 heads out of 8 with a fair coin would be

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