How many different arrangements can be made of all the letters of the word 'ENGINEERING"? In
how many of them the three E's stand together and in how many will they stand first?
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there are 3 E,3N,2G,2I and 1R.
Total no. of arrangements when all three Ns come together=9!3!2!2!....(1)
Total no. of arrangements when all three Ns and Es come together=7!2!2!....(2)
Required ways=>(1)-(2)=13860
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