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If S=R,A={x:-3lexlt7} and B={x:0ltxlt10}...

If `S=R,A={x:-3lexlt7} and B={x:0ltxlt10}`, the number of positive integers in `ADeltaB` is

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The correct Answer is:
3
Here, `A=[-3,7),B=(0,10)`
`S=(-oo,oo)`
`therefore A-B=[-3,0]andB-A=[7,10)`
`therefore ADeltaB=(A-B)uu(B-A)=[-3,0]uu[7,10)`
`therefore` Positive integers are 7, 8, 9.
Number of positive integers = 3
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