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How many words can be formed with the letters of the word 'GUJRAT', if all vowels are always together?

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To solve the problem of how many words can be formed with the letters of the word 'GUJRAT' if all vowels are always together, we can follow these steps: ### Step 1: Identify the vowels and consonants The word 'GUJRAT' consists of the letters: G, U, J, R, A, T. Here, the vowels are U and A, and the consonants are G, J, R, T. ### Step 2: Treat the vowels as a single unit Since we want the vowels to always be together, we can treat the combination of the vowels (UA) as a single unit. Therefore, we can represent the letters as: - (UA), G, J, R, T This gives us a total of 5 units to arrange: (UA), G, J, R, T. ### Step 3: Calculate the arrangements of the units The number of ways to arrange these 5 units is given by the factorial of the number of units: \[ 5! = 120 \] ### Step 4: Calculate the arrangements of the vowels within their unit Within the unit (UA), the vowels can be arranged among themselves. The arrangements of the vowels U and A can be calculated as: \[ 2! = 2 \] ### Step 5: Calculate the total arrangements To find the total number of arrangements where the vowels are always together, we multiply the arrangements of the units by the arrangements of the vowels: \[ \text{Total arrangements} = 5! \times 2! = 120 \times 2 = 240 \] ### Final Answer Thus, the total number of words that can be formed with the letters of the word 'GUJRAT', with all vowels together, is **240**. ---
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NAGEEN PRAKASHAN-PERMUTATION AND COMBINATION -Exercise C
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