Find the union of each of the following pairs of sets :(i) $X=\left\{1,3,5\right\}$ $Y=\left\{1,2,3\right\}$
(ii) $A=\left[a,e,i,o,u\right\}$ $B=\left[a,b,c\right\}$
(iii) $A=$ {x : x is a natural number and multiple of 3} $B=$ {x : x is a natural number less than 6}
(iv) $A=$ {x : x is a natural number and $1<x\le 6$ } $B=$ {x : x is a natural number and $6<x<10$ }
(v)$A=\left\{1,2,3\right\},B=\phi$

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