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The combination formula is usually written as nCr representing the number of combinations of r objects at a time taken from n.

nCr = n!/[r!*(n-r)!]

The permutation formula is usually written as nPr representing the number of permutations of r objects at a time taken from n.

nPr = n!/r!

Where n! [n factorial] is 1*2*3*....*(n-1)*n

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Q: How do you write a combination and permutation formula?
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