Is anyone good with permutations? i can’t quite get the answer right for 4 b)

4. edinburgh high school has a twelve-member student council. a four member
sub-committee is to be selected to organize dances.
a) how many different sub-committees are possible?

b) how many four member sub-committees are possible if the council
president and vice-president must be members?
han fua ouards and even forvarde on his baskethall team.

Step-by-step explanation:

4b) 2 members are pre-selected for the subcommittee, so there are 2 spots left and 10 people remaining to choose from.  

5b) 1 of the guards is pre-selected for the team, so there is only 1 spot left and 4 people remaining to choose from. There are still 3 spots for the forwards out of 7 people.    

Note: Your answers are correct for 4a and 5a

answer: 21$

step-by-step explanation:

$42 / $14 = 3   (ratio 3: 1)

$7 x 3 = $21