How many distinct 5 letter words ..

G

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How many distinct 5 letter words can be made by arranging the word LINDSAY if D must be included?

is this correct, 6P4 = 360 since there are 6 letters to choose from but 4 letters are needed?

thanks for the help
 
7P5- 6P5= 2520- 720=1800?

Total amount of letters (5) to make LINDSEY - If D is not included

did I do this right?..
 
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