.
In 3 * 7 * 3 = 63 ways.
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Comment from student: Thank you so much. I am atruggling statistics and need so much help. I just dont get this stuff at all
My response : Is this comment came from you ?
Unfortunately, this forum works in such a way, that I can not identify comments with problems -- therefore I am asking.
But if this comment is from you, then I can help.
In this site, there are TWO HUGE BLOCKS of lessons.
The first block is on Combinations and Permutations
- Introduction to Permutations
- PROOF of the formula on the number of Permutations
- Problems on Permutations
- Math circle level problem on Permutations
- Introduction to Combinations
- PROOF of the formula on the number of Combinations
- Problems on Combinations
- Arranging elements of sets containing indistinguishable elements
- Persons sitting around a cicular table
- Combinatoric problems for entities other than permutations and combinations
- Miscellaneous problems on permutations, combinations and other combinatoric entities
- In how many ways N distinguishable objects can be distributed among n different boxes ?
- OVERVIEW of lessons on Permutations and Combinations
A convenient place to quickly observe these lessons from a "bird flight height" (a top view) is the last lesson in the list.
The second block of lessons is on Elementary Probability
- Simple and simplest probability problems
- Solving probability problems using complementary probability
- Elementary Probability problems related to combinations
- A True/False test
- A multiple choice answers test
- Coinciding birthdays
- A shipment containing fair and defective alarm clocks
- People in a room write down integer numbers at random
- A drawer contains a mixture of socks
- Students studying foreign languages
- Probability for a computer to be damaged by viruses
- Conditional probability problems
- Typical probability problems from the archive
- Geometric probability problems
- Advanced probability problems from the archive
- Challenging probability problems
- Selected probability problems from the archive
- Experimental probability problems
- Rolling a pair of fair dice
- Ten pairs of shoes are kept in a rack
- A diplomat and spies
- Elementary operations on sets help solving Probability problems
- Unusual probability problems
- OVERVIEW of lessons on Probability
Again, a convenient place to quickly observe these lessons from a "bird flight height" (a top view) is the last lesson in the list.
Try to read it. Do not try to read everything in a row.
Select what is more interesting to you.
Do not struggle on difficult spots -- you can return to them later.
It is INTERESTING reading, and I hope you will fall in love in it.
Also, you have this free of charge online textbook in ALGEBRA-II in this site
- ALGEBRA-II - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this online textbook under two topics
- Combinatorics: Combinations and permutations, and
- Solved problems on Probability.
Save the link to this textbook together with its description
Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson
into your archive and use when it is needed.
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You are a happy person ---- the entire treasure suddenly fell at your legs . . .