MediumMathematicsHigh School (11–12)Algebra › Permutations and CombinationsNumericalBoard ExamA-LevelIB
Kavya has 4 red, 3 blue and 2 green tiles…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Kavya has red, blue and green tiles. Tiles of one colour look alike. How many different rows of all nine tiles can she lay?
Need a reminder? The key ideaShow
When objects are alike of one kind, alike of another and so on, objects have arrangements. To keep alike objects together, glue them into one block, which has one order inside.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The tiles. in all, with groups of , and alike.
Step 2. The formula. .
Answer: rows.
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