Thankyou To All Of Those People In Math Forum Who Heped Me In My Time Of Need.
You Have My Eternal Gratitude, I Just Wanna Know How You Guys Do So Good In Math..........is There A Secret??!!!!!!because Even I Do My Homework And I'm Having Trouble Studying For My Grade 12 Geometry Exam!!!!!!
Aha! i knew there was a more efficient way to do this. we can use Pascal's formula. i think it's better for you to do (b) that way, as well as question 2 that i did earlier maybe (if you want to).
By Pascal's Formula,
So, we have:
.........now expand the last combination using the formula
Now,
as desired
QED
Now, wasn't that a lot nicer?!