Hi, In STUDY room, partining example sets it is written that (Number of ways of arranging 7 letters in 7 envelopes(different A-G) such that each envelope gets a letter is 7! . I want to know how ?

Hi Ishan, can you please explain your doubt in detail? I am not able to follow it.

As you are a premium student, can you please use the 'Ask a Doubt' feature and post your doubt below the solution itself?