An experiment involves 30 participants. from these a group of 5 participants is to be tested under a special condition. how many groups of 5 are possible?

Wel, in this question you're gonna use combination  

you need to combinate 20 participants in groups of four  

so you make a combination:  

Combination of 20, 4 =  

Using the formula, you have:  

20! / (20 - 4)! . 4!  

20! / 16! . 4!  

20 . 19 . 18 .17 . 16! / 16! . 4 . 3 . 2  

20 . 19 . 18 . 17 / 4 . 3 . 2  

simplifying:  

5 . 19 . 3 . 17  

4845  

So the answer is 4845  

I hope helped you

the answer is $42.96

step-by-step explanation:

answer: input the dimensions of the room to be painted. click the button to calculate the amount of paint and man-hours needed for this job.

interior paint coverage depends on the brand of paint used. the coverage amount is listed on the label of the paint can. use this to adjust the values in the paint coverage section below. paint usually is applied at 350 to 400 square feet per gallon (primer at 200 to 300 square feet per gallon).

step-by-step explanation: