How many distinct three-letter sequences with at least one $``T"$ can be formed by using three of the six letters of $TARGET?$ One such sequence is $``T-R-T."$
Question:
How many distinct three-letter sequences with at least one $``T"$ can be formed by using three of the six letters of $TARGET?$ One such sequence is $``T-R-T."$
Answer:
Let's think step by step.

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How many distinct three-letter sequences with at least one $``T"$ can be formed by using three of the six letters of $TARGET?$ One such sequence is $``T-R-T."$
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