Answer:
This abstract form of the Wason selection task generally yields the following distribution of answers (Wason & Shapiro, 1971): ~ 45% pick the Acard and the 4card ~ 35% pick the Acard alone ~ 7% pick the Acard, 4card, and the 7card ~ 4%pick the Acard and the 7card [correct] ~ 9% pick other combinations of cards