this is another problem for me.. i always stuck on playing card problems:

hope some one can guide me on this

Question:

From a pack of 52 playing card, two card are selected without replacement. What is the probability that:

(a) both card are diamond (ans: 1/17)

(b) both card are same suit(ans: 4/17)

(c) one card is a spade and the other a club (ans: 13/102)

(d) both card are different suits? (ans: 13/17)

thank for your time