Answer: The size of the sample space of this two-stage experiment is 52 .
Explanation:
The given experiment : If heads occurs, then a card is selected at random from the clubs and spades suits. If tails occurs, then a card is selected at random from the hearts and diamonds suits.
For the occurrence of heads, there will be 26 cards which can be chosen from clubs and spades suits.
For the occurrence of tails, there will be 26 cards which can be chosen from hearts and diamonds suits.
Therefore the size of the sample space = 26+26=52.