What are the chances of selecting the identical card from 2 individual and separate decks of cards? ?

Answer 1

1/52

Unless you are specifying a specific card in advance, in which case it is 1/2704.

Answer 2

1/2704.

(1/52 x 1/52)

Answer 3

Assuming a 52 card deck:

1/52 * 1/52