1. A card player holds 13 cards of four suits, of which seven are black and six are red. There aretwice as many hearts as clubs and twice as many diamonds as hearts. How many spades does he hold?

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2. A blind man had only black or white socks. In his drawer he had 4 socks. He went to the drawer and took out 2 socks. The chances that he had a pair of white socks was 1/2. What were the chances that he had drawn out a pair of black socks?

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3. A murderer is condemned to death. He has to choose between three rooms. The first is full of raging fires, the second is full of assassins with loaded guns, and the third is full of lions that haven't eaten in 3years. Which room is safest for him?

YOUR ANSWER:

MEDIUM

4. Can you find a five letter word, which, when typed in upper case, reads the same upside down?

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5. If you overtake the last person, what position are you in?

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6. What is the next 3 letters in this riddle? o t t f f s s_ _ _

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7. Crack this decipher puzzle

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8. And this too

YOUR ANSWER:

DIFFICULT

9. What is the only letter which is not present in the periodic table?

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10. The names of 100 prisoners are placed in 100 wooden boxes, one name to a box, and the boxes are lined up on a table in a room. One by one, the prisoners are led into the room; each may look in at most 50 boxes, but must leave the room exactly as he found it and is permitted no further communication with the others. The prisoners have a chance to plot their strategy in advance, and they are going to need it, because unless every single prisonerfinds his own name all will subsequently be executed. Find a strategy for them which hasprobability of success exceeding 30%.