If the coin has equal probability of landing heads up or tails up each time it is flipped , what is the probability that the coin will land heads up exactly twice in 3 consecutive flips?
1) 0.125
2) 0.25
3) 0.375
4) 0.5
5) 0.666






P(Heads) = PTails = 1/2

A - P(Heads in first flip) ,B - P(Heads in 2 flip), C - P(Heads in 3 flip)
A' - P(Tails first flip) ,B' - P(Tails in 2 flip), C' - P( Tails in 3 flip)

ABC' + A'BC + AB'C = 3/8

Ans -C