Question

Three fair coins are tossed simuItaneousIy Find the proalint (a) getting one head (b) getting (c) getting at least two head (d) getting 3 heads when It Is known that first two are heads. Select the correct answer from above options

Answer 1

n(S) = 8 (a) A: getting one Head = (HTH, HTT, TTH) = n(A) = 3 P(A) = 3 8 3 (b) B : getting atmost one head (TTT TTH, THT, HTT) n(B) = 4 P(B) = 4 8 4 = 1 2 1 (c) C : getting atleast two heads = {HHT, THH, HTH, HHH}, n(C) = 4 8 4 = 1 2 1 (d) D: first 2 are heads, E: 3 heads