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Q.

The number of four letter words can be formed from the letters of the word INFINITY so that 3 are alike, one is different is

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a

8C4

b

4

c

16

d

8

answer is C.

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Detailed Solution

G.T 3 are alike ,that letter must be I, the remaining letter is any one of N,F,T,Y =4c1.4!3!=16
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