what are the odds of drawing a spade and a heart out of a regular deck of playing cards?

How many cards are drawn? Are the cards replaced following each draw?

If only two cards are drawn and the cards are not replaced, there is a 1/4 chance the first card is a spade and a 13/51 chance the second is a heart. The probability of both happening is
1/4 x 13/51 = 13/202.
There is an equal probability that a heart is drawn first and a spade second.

The total probability of one or the other is therefore 13/101 = 0.1287

If the first card drawn is replaced in the deck, the total probability becomes 1/8 = 0.1250