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# Binomial expansion help please (C2) Watch

1. Evaluate the quantities:

I did this:
=

But when I type that in the calculator, I get math error :/ I checked the answer at the back of the book and it says its 100, what am I doing wrong? :/
2. (Original post by Nkhan)
Evaluate the quantities:

I did this:
=

But when I type that in the calculator, I get math error :/ I checked the answer at the back of the book and it says its 100, what am I doing wrong? :/
It is impossible for a calculator to calcualate 100 and 99!
3. Think what a factorial is.

100! = 100x99x98...x3x2x1
99! = 99x98x97.....x3x2x1

4. (Original post by jonathan3909)
It is impossible for a calculator to calcualate 100 and 99!
99! is a factor of 100!, so just divide one by the other.

Edit: whoops, sorry for quoting the wrong person.
5. (Original post by Nkhan)
Evaluate the quantities:

I did this:
=

But when I type that in the calculator, I get math error :/ I checked the answer at the back of the book and it says its 100, what am I doing wrong? :/
Or think of

so
6. Lol I just remembered I can always use the nCr button on the calculator to quickly give me the answer!
But thanks guys
7. (Original post by Nkhan)
Lol I just remembered I can always use the nCr button on the calculator to quickly give me the answer!
But thanks guys
But plugging such a simple thing into a calculator won't reinforce your understanding...

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