Permutations Year 11 Question (1 Viewer)

[RC_99]

Any help with this question, specifically part h) [the answer is 70 to this part] would be appreciated.
(The question if from Yr 11 Cambridge, Exercise 14D)

 

[fan96]

For h), the first and last forms are fixed.

The remaining eight can be either yes or no, but exactly four (any four) must be yes.

So choose four from eight:

 

[RC_99]

Thanks for your help!