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# Maths S1 HELP! watch

1. Hello. Please can someone show me how to get this answer...

WRITE IN FACTORIAL NOTATION:

1) 8X7X6 DIVIDED BY 5X4X3

the answer in 8!x2! divided by 5!x5! according to the textbook answers but I don't know how to get it.

Cheers.
2. (Original post by metaljoe)

WRITE IN FACTORIAL NOTATION:

1) 8X7X6 DIVIDED BY 5X4X3

the answer in 8!x2! divided by 5!x5! according to the textbook answers but I don't know how to get it.

Cheers.

You know what factorial is right?
For example,

You're given

That looks very similar to

But notice that we're missing the
i.e. the rest of the terms after 6.

And notice how

So we can argue that

That gets rid of all the terms after 6 so we're just left with

Now apply the same logic to
Spoiler:
Show
It looks very similar to .

How could you get rid of all the terms after 3?

Once you have both, the answer should coalesce.
3. pointless question for S1
4. (Original post by RMNDK)
You know what factorial is right?
For example,

You're given

That looks very similar to

But notice that we're missing the
i.e. the rest of the terms after 6.

And notice how

So we can argue that

That gets rid of all the terms after 6 so we're just left with

Now apply the same logic to
Spoiler:
Show
It looks very similar to .

How could you get rid of all the terms after 3?

Once you have both, the answer should coalesce.
Thank you very much. I know it may seem simple but I struggle with this chapter in statistics so I appreciate your help. Have a good rest of your week!

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