You have 20 different neckties in your wardrobe. How many combinations of three ties could you choose?
From the detailed question i picked the word Combinations
Which i should believe the question is gotten from the topic; Permutation and Combination..
Follow this simple steps..
You have 20 Neck ties, out of 3 ties could you choose..
It goes with this formula of combination;
Hope that's clear??
There will be:
However within these the same groups will be repeated.
For example Red, Blue, Green, and Red, Green, Blue, and Blue,Red, Green are all the same combination of colours.
So the total number of possible combinations is