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JEE MATHEMATICS MCQ: PERMUTATIONS

1 Easy

1 of 1

Application +4 | -1

The number of ways in which

r

letters can be posted in

n

letterboxes in a town is

View answer and explanation

Correct option: A

n^{r}

Option A (

n^{r}

) is correct because each of the

r

letters can be posted in any of the

n

letterboxes, giving

n

choices for each letter.

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\left( {m + n} \right)

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n

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