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Q.

The number of five-letter words formed with the letters of the word CALCULUS is

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answer is 1110.

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Detailed Solution

C-2,   A-1,  L-2,  U-2,  S-1This can be done in 3 ways2identical+2identical+1 different  =    5!2! 2!1! 3c2  3c1 = 270  (3c2 to select 2 from C,L,U, 3c1  to select 1 from remaining three)    2 identical+3 different = 5!2! 3c1 4c3     = 720 ( 3c1  to select 1 repeating letter , 4c3to select from remaining 2 repeated and 2 non repeated letters)All 5 different letters =5!=120 total number of words= 1110
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