A group of k elements can be chosen from a group of n elements in

ways.

The answer is B. 495.
Answer:
B. 121 I'm sorry if its not correct
Answer:
there u go
Step-by-step explanation:
Hope It helps u ....
In general the binomial expansion is

So in our case, because we want ascending powers of x we'll write,

We need to calculate the binomial coefficients:





