Bunuel wrote:
The letters D, G, I, I , and T can be used to form 5-letter strings as DIGIT or DGIIT. Using these letters, how many 5-letter strings can be formed in which the two occurrences of the letter I are separated by at least one other letter?
A) 12
B) 18
C) 24
D) 36
E) 48
Letters are DGIIT - 5 letters...
Total no. of 5 letter string that can be formed = 5!/2! = 5*4*3 = 60
Total no. of 5 letter string that in which 2 I are together that can be formed = 4! = 4*3*2 = 24
So, 5-letter strings can
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