Each card has a unique combination of one of six ranks 9,10, J, Q ,K, A and 1 of 4 suits. Suppose you draw a hand of four cards from a eucre deck assuming all cards are equally likely.

What is the probability that our hand is all 1 suit?

What is the probability that our hand has all 4 suits?

What is the probability that our hand is all of one rank?

What is the probability that our hand contains four different ranks?

thanks in advance for helping me understand this one