Answer:

1.A={5,15,25,35}

2.B.={49,50,60,70}

3.Since A={5,10,15,29,25,39,35}and

B={10,20,30,40,50,60,70}

4.AUB={10,20,30}

5.A=4

B=4

Thus AUB=11

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