90 gifts were distributed in a party.Everyone presented a gift to qnother. How many person were there in the party ?

Dear student
Let there were x persons in the party.x(x-1)=90x2-x-90=0x2-10x+9x-90=0x(x-10)+9(x-10)=0(x+9)(x-10)=0x+9=0 or x-10=0x=-9  (rejected as persons cannot be negative) or x=10x=10
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