Question

A fair coin is tossed three times. What is the probability that exactly two head appear?

Answer 1

Step-by-step explanation:

▪️Denote the required probability by P.

▪️P = P(A/B) = P(A intersection B)/ P(B)

▪️Now:

▪️A => getting 2 heads in a rowB => exactly two heads occur

▪️A intersection B = { THH, HHT }.

Cardinality is 2.

▪️B = { THH, HTH, HHT }. Cardinality is 3.

▪️Therefore, P = 2/3 = 66%

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