Question

a

Answer 1

\[_{11}C_{x}\]

is the number of ways to have exactly x tails.

Answer 2

what is the answer? i got 330

Answer 3

no

Answer 4

you have at most 4..not exactly 4

so you need to calculate it for 0,1,2,3 and 4

Answer 5

is the answer 561?

Answer 6

you are off by 1

Answer 7

\[\Large\sum_{x=0}^{4}\, _{11}C_{x}=562\]

Answer 8

ah thats because i didnt do it for 0