The probability that A hits the target exactly twice is C4,2 (2/3)? ( 1-2/3)? =8/27

B The probability of hitting the target exactly three times is C4, 3 (3/4) 3 (1-3/4) = 27/64.

So the probability that A hits the target exactly twice and B hits the target exactly three times is: 8/27*27/64= 1/8.