Hey have a look at these

You have 2 standard 52 card decks of cards that have been shuffled randomly. You turn over the first card from the first deck, and the first card from the second deck,

(i) What is the probability they match?

(ii)You keep turning over the top card on each deck, until you have gone through the whole deck. How many matches do you expect to find?

(iii) You have a thousand letters and envelopes addressed to people, the envelopes get mixed up and the letters get randomly put into envelopes. How many do you expect to end up in the right envelope?

I thought there was a 1/52 chance for the first part but the other parts were confusing. Can anyone help? I'd really appreciate it