Union Public Service Commission (UPSC) has released the NDA Result II 2022 (Name Wise List) for the exam that was held on 4th September 2022. Earlier, the roll number wise list was released by the board. A total number of 400 vacancies will be filled for the UPSC NDA II 2022 exam. The selection process for the exam includes a Written Exam and SSB Interview. Candidates who get successful selection under UPSC NDA II will get a salary range between Rs. 15,600 to Rs. 39,100.
Last updated at Jan. 13, 2022 by Teachoo
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There are $3$ vowels and $5$ consonants. I first arranged $5$ consonants in five places in $5!$ ways. $6$ gaps are created. Out of these $6$ gaps, I selected $3$ gaps in ${}_6C_3$ ways and then made the vowels permute in those $3$ selected places in $3!$ ways. This leads me to my answer $5!\cdot {}_6C_3 \cdot 3! = 14400$. The answer given in my textbook is $36000$. Which cases did I miss? What is wrong in my method? $\endgroup$ 2 Text Solution Solution : The letters of the word daughter are “d,a,u,g,h,t,e,r”.<br> So, the vowels are ‘a, u, e’ and the consonants are “d,g,h,t,r”.<br> (i)Now, all the vowels should come together, so consider the bundle of vowels as one letter, then total letters will be `6`.<br> So, the number of words formed by these letters will be `6!`<br> but, the vowels can be arranged differently in the bundle, resulting in different words, so we have to consider the arrangements of the `3` vowels.<br> So, the arrangements of vowels will be `3!`<br> Thus, the total number of words formed will be equal to `(6!×3!)=4320`<br> (ii)First arrange `5` consonants in five places in `5!` ways.<br> `6` gaps are created. Out of these `6` gaps, select `3` gaps in `6_(C_3)` ways and then make the vowels permute in those `3` selected places in `3!` ways.<br> This leads `5!×6_(C_3)xx3!`=14400. |