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Sagot :
Answer:
A. 5 groups
Step-by-step explanation:
You would use multiplication for this. just think what does 4 × _ = 20? well 5! since four times give is twenty.
Answer:
4845
.020639% (or 1/4845)
Step-by-step explanation:
For the first one we have to use combinations (because the order doesn't matter)
The formula is as follows:
for ACB
[tex]\frac{A!}{(A-B)!*B!}\\\\\frac{20!}{(20-4)!*4!}=4845[/tex]
2.
for probabilty the odds of an outcome is just: number of times the requirement is satisfied/total number of possibliites
we know that there are 4845 possbile groups and only one in which we get all of our friends so it's just
1/4845= .020639%
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