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Permutations — MATHS STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSPermutations1 Mark
Question
In how many ways can 4 letters be posted in 5 letter boxes?
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Answer

Total number of letters = 4
Total number of letter boxes = 5
$\therefore$ The number of ways in which 4 letters posted in 5 letters boxes = 5 × 5 × 5 × 5
= 54

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