PLEASE HELP ME WITH THESE QUESTIONS!! :((( #2 & 4a)

2 a. 210 ways

b. 50 ways

c. 28 ways

d. 0.205

4 a. 1716 ways

Step-by-step explanation:

2. a. The number of ways, of selecting without restriction is given as follows;

= 10!/(4!(10 - 4)!) = 210

b. The number of ways of selecting 3 boys from 5 is 5!/(3!(5 - 3)!) = 10 ways

The number of ways of selecting the remaining 1 girl from 5 = 5!/(1!(5 - 1)!) = 5 ways

The number of ways of the selection where there must be three boys = 5×10 = 50 ways

c. Given that Maggie and Marley must be chosen, each of whom can be chosen only one way, we have;

Selection of 2 from 8 gives;

8!/(2!(8 - 2)!) = 28

Therefore, the number of ways of the selection where there must be Maggie and Marley is 28 × 1 × 1 = 28 ways

d. The probability of no boys is given by the relation;

P(k success from n trials) =

Where n = number of persons = 10

k = Number of person in the group = 4

p = Probability of success of girls = 1/2

Therefore, we have for no boys;

4a) The number of ways of selecting 9 softball players from 15 where Rylea and Emily must be included;

Given that Rylea and Emily are already selected, we have;

The number of ways of selecting 7 softball players from 13 given as follows;

13!/(7!(13 - 7)!) = 1716 ways

Given that Rylea and Emily can both be selected in only one way, the total number of ways = 1×1×1716 = 1716 ways

the answer is a

step-by-step explanation:

because your just changing the position of where the shape is

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐