Answer:
13800
Step-by-step explanation:
The order of the members is important (because each selected member will receive a different position), thus we then need to use the definition of permutation.
There are 25 members, of which 3 are selected.

Evaluate the definition of a combination:

Answer:

Step-by-step explanation:
From law of indices
8a^2 + 3a^2
11a^2
since both have a^2 you only have to add the coefficients
The answer to the first one is A, the second one is 3.58333