Online Course Discussion Forum
Need help on winter camp blue Combinatoris p8, p9 and p10
For #8: The Hint is Spot-on. Remember:
Probability of surviving in spot A_n = n/10 * probability of surviving in spot A_n-1 +
(10-n)/10 * probability of surviving in spot A_n+1
And A_5. Hmmm.... It's not leaned in one way or another.
For #9: Casework with number of heads!
For #10: Geometric sequences can be written as a, ar, ar^2, ar^3, ar^4....ar^29. How can you choose 3 of these such that they are in a geometric sequence. (This is casework with ratio)
Hope these helped! Might have given away too much.