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Permutation and Combination - Quant/Math - CAT 2016


Question 4 the day: June 6, 2003

The question for the day is from the topic Permutation and Combination.

Question:
How many ways can 10 letters be posted in 5 post boxes, if each of the post boxes can take more than 10 letters?

(1) 5^10
(2) 10^5
(3) 10P5
(4) 10C5
Correct Answer - (1)

Solution:


Each of the 10 letters can be posted in any of the 5 boxes.

So, the first letter has 5 options, so does the second letter and so on and so forth for all of the 10 letters.

i.e. 5*5*5*.*5 (upto 10 times)

= 5 ^ 10.


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