Playing card puzzles (3)

This is the third post with puzzles about playing cards.

1) Which hands are valid?^****/*****
In a game, the following six hands are valid plays:

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Which of the following three hands is / are valid?

You can check your solution here

New puzzles are published at least twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars.

Playing card puzzles (2)

Last month I published two puzzles with playing cards. Here are two more in the same line:

For those who missed the puzzles, look at the figure below. It shows 16 cards, one of which is hidden. At the bottom you find 4 cards. Which of those 4 cards should replace the hidden card?

3) Playing cards puzzle 3^***/*****

You can check your solution here

4) Playing cards puzzle 4^***/*****

You can check your solution here

New puzzles are published at least twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars.

Bongard problem 37

Which rule satisfies the 6 figures on the left but is obeyed by none of the 6 figures on the right?
1)Bongard problem 37^**/*****



All letters used have font size 48.

In 1967 the Russian scientist M.M. Bongard published a book containing 100 problems. Each problem consists of 12 small boxes: six boxes on the left and six on the right. Each of the six boxes on the left conform to a certain rule. Each and every box on the right contradicts this rule. Your task, of course, is to figure out the rule.

You can check your solution here

You can find more Bongard problems here on this site and at Harry Foundalis’ site.

New puzzles are published at least twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars.