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formula for how many possible combinations. We know that Combination C n r nr. We might ask how many ways we can select 2 letters from that set.
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The formula for the calculating combinations is. Lets apply this equation to our problem with colorful balls. You can check the result with our nCr calculator.
How many different committees of 4 students can be chosen from a group of 15.
Lets apply this equation to our problem with colorful balls. There are 496 combinations without repetition. It will list all possible combinations too. We need to determine how many different combinations are there.
