Question

# In how many ways can 7 letters be posted in 4 letter boxes?

Solution

## Each letter can be posted in any one of the 4 letter boxes. Number of ways of posting one letter = 4 ∴ Required number of ways of posting the 7 letters = 4$×$4$×$4$×$4$×$4$×$4$×$4 = ${4}^{7}$MathematicsRD Sharma XI (2015)Standard XI

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