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# Help with summation/ sigma question watch

1. I'm not quite sure on where to start with part a).

2. These look like they require induction,ask if you need more of a hint.

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3. (Original post by Happy3690)
These look like they require induction,ask if you need more of a hint.

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Yeah they do require induction. How would you express the matrix?
4. (Original post by jake4198)
Yeah they do require induction. How would you express the matrix?
There is no matrix..

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5. First look at the base case n=1,does that satisfy the requirement?

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6. (Original post by Happy3690)
There is no matrix..

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What does the 2n 2k mean? How would you get a term from that?
7. the "Matrix" is actually a way of expressing nCr
8. (Original post by jake4198)
What does the 2n 2k mean? How would you get a term from that?
It means (2n)!/(2k)!(2n-2k)!

Are you familiar with factorial?

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9. (Original post by Happy3690)
It means (2n)!/(2k)!(2n-2k)!

Are you familiar with factorial?

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That's excellent. Thanks for your help.
10. (Original post by jake4198)
That's excellent. Thanks for your help.
np

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