The letters D, G, I, I, and T can be used to form 5-letterstrings

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The letters D, G, I, I, and T can be used to form 5-letterstrings such 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、12.0
B、18.0
C、24.0
D、36.0
E、48.0

答案：D

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老师请问这题的解题思路是什么呀？

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老师，麻烦问一下这题为什么不是120-24呢

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