Three Math Quickies

  1. After four bridge hands have been dealt, which is the more likely: that you and your partner hold all the spades, or that you and your partner hold no spades?
  2. If you took three bananas from a dish holding thirteen bananas, how many bananas would you have ?
  3. A secretary prints out six letters from the computer and addresses six envelopes to their intended recipients. Her boss, in a hurry, interferes and stuffs the letters into the envelopes at random, one letter in each envelope. What is the probability that exactly five letters are in the right envelope?

More fun later 🙂

Nalin Pithwa


  1. Anubhav C. Singh
    Posted August 11, 2015 at 4:49 pm | Permalink | Reply

    1. Exactly half, as if you and your partner have all spades, your opponents have none, and vice versa.
    2. 16, as you take 3 bananas while you are holding 13.
    3. None, as if five letters are in the right envelope, the sixth has to be so too.

  2. pradeepselvaraju
    Posted October 13, 2015 at 10:45 am | Permalink | Reply

    1. the partner and our self will have all spades and the opponents have none.
    2. U TAKE 3 BANANAS from a dish HOLDING 13 BANANAS. So we are already holding 13 bananas and we take 3 more so we have 16.
    3. Sir i do not know probability.

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