TS EAMCET · Maths · Permutation Combination
The number of ways in which four letters can be put in four addressed envelops so that no letter goes into envelope meant for it is
- A 8
- B 12
- C 16
- D 9
Answer & Solution
Correct Answer
(D) 9
Step-by-step Solution
Detailed explanation
Let \(n=4\) be number of envelopes in which number letters goes into envelope meant for it. Then, the number of ways \(=4 !-\sum_{k=1}^4{ }^4 C_k\)…
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