Show that the set of letters needed to spell “CATARACT” and the set of letters needed to spell “TRACT” are equal.
For “CATRACTR”
Letters in word are
{C, A, T, R} ={A, C, R, T}
For “TRACT”
Letters in word are
{T, R, A, C} = {A, C, R, T}
As we see letters need to spell cataract is equal to set of letters need to spell tract.
Hence Proved.