Answered

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what is the roster form of set a of the distinct letters of the word PHILLIPINES

Sagot :

AnneCidn
A = {p,h,i,l,n,e,s}

It basically just a list of the letters, but repetition of elements in the list is not necessary.
Knowellidn
{P,H,I,L,N,E,S}

you shouldn't use the same letter twice nor trice. it should be one only. so you can see one I instead of three