Three unbiased coins are tossed. What is the probability of getting at most two heads?

Question

নিচের অপশন গুলা দেখুন

• 3/8
• 3/4
• 1/4
• 7/8

Answer 1

সঠিক উত্তর হচ্ছে: 7/8

ব্যাখ্যা:

Getting at most Two heads means 0 to 2 but not more than 2
Here S = {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}
Let E = event of getting at most two heads
Then E = {TTT, TTH, THT, HTT, THH, HTH, HHT}
∴ P(E) = n(E)/n(S) = 7/8