Q. |
In how many ways can 5 letters be inserted into 2 letter boxes? |
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A. 10 |
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B. 25 |
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C. 32 |
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D. 5! * 2! |
The first letter can be inserted into any of the 2 boxes = 2 ways
The second letter can be inserted into any of the 2 boxes = 2 ways
All letters can be inserted in 2 × 2 × 2 × 2 × 2 = 32 ways
(Principle of Multiplication)