4 thoughts on “Pascal’s Triangle: Examples

  1. Hi, What is wrong with this approach?
    Step 1 : Select 2 women = 8C2
    Step 2 : Select 4 from the remaining = 13C2

    Answer=8C2*13C2

    please help

  2. Double counting…if you select say A and B as the 2 women in your 8C2 and then in the 13C2 you add C and D. In another case you select C and B in the 8C2 and A and D in the 13C2. Yet another you select A and C in the 8C2 and B and D in 13C2. You are treating all as different cases. But they are one and the same.

    regards
    J

    • The term “Double counting” in PnC doesn’t necessarily mean exactly double. It could be 3-4 times; we use “double counting” to indicate that some multiple counting type error is present.

      In the example I took with AB and CD, we could also get AC and BD, AD and BC and so on; each case would be counted 6 times. (With 3 women each case would be counted thrice I think.)

      regards
      J

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