[SPM Add Math Sabah Paper 2] How to solve question (a)(i)?


(a) Kebarangkalian Aziz menang dalam suatu pertandingan memanah ialah 0.25.
Sebanyak n pertandingan dijalankan. Kebarangkalian dia menang tepat 4 pertandingan adalah tiga kali kebarangkalian dia menang tepat 3 pertandingan.

The probability of Aziz wins in an archery competition is 0.25. The games are played for n times. The probability he wins exactly 4 games are three times the probability he wins exactly 3 games.

(i) Cari nilai bagi n.
Find the value of n.


Hi Farhaini,
You’re in the right direction, we just need to get rid of the higher powers which will make things a lot easier!

We proceed to use the ^nC_r formula to further eliminate like terms:


Hope this helps! :slight_smile:

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Thank you very muchh !! :star_struck::star_struck::grin::+1::+1:

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