- #1

- 188

- 0

Can someone explain this part?

Knowing that P(k)=P(X=k)=c(101-k)

For a 'turtle' that can live up to 100 years, find 'c'.

And it goes

I don't understand the jump from cΣk to c100(100+1)/2

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- Thread starter cdux
- Start date

- #1

- 188

- 0

Can someone explain this part?

Knowing that P(k)=P(X=k)=c(101-k)

For a 'turtle' that can live up to 100 years, find 'c'.

And it goes

I don't understand the jump from cΣk to c100(100+1)/2

- #2

DrClaude

Mentor

- 7,607

- 4,009

\sum_{k=1}^n k = (1+n) \frac{n}{2}

$$

To see how to get the formula, list the numbers of the sum, then sum the first with the last, the second with the second to last, etc.

- #3

- 188

- 0

Ah, hacky. I was expecting a more straightforward way.then sum the first with the last, the second with the second to last, etc.

Thank you!

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