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Four letter words from the letters of ROSE, with no letter repeated, number:
A16
B24
C12
D36
Answer & Solution
Correct answer: B. 24
1. The first place has 4 choices, then 3, then 2, then 1.
2. Multiply those together.
3. The count is 24.
_Source: NCERT Class 11 Mathematics, Chapter 7, Permutations and Combinations._
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