What is a combination in mathematics?

Definition A combination is an arrangement of objects in which order does not matter There are 3 books on a shelf, a Math (M) book, a Physics (P) book, and a French (F) book. Suppose, you want to take any 2 books out The possibilities are: MP MF PM PF FM FP Remove the repetitions PM, FM, FP as they are the same as MP, MF, and PF Now, we are left with only 3 possibilities and they tell us the combinations of books that you can probably take out Combination of r objects out of n objects is nC r n! /(n - r)!

R! We can use this formula. Here, n!

Means 1x2x3x...xn Source: icoachmath.com.

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