SOLUTION
The man has 4 pairs of shoes
3 suits and
4 shirts
Probability is given as
If he is to pick his favorite pair of shoes, suit and shirts, it means he will pick 1 pair of shoe, 1 suit and 1 shirt.
Then the probability of picking
His favorite pair of shoes becomes
Then the probability of picking
His favorite suit becomes
And Then the probability of picking
His favorite shirt becomes
Hence the required probability is
Hence the answer is