If n(A)=10, n(B)=20, c=5 in the given Venn diagram. Find a and b.

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If n(A)=10, n(B)=20, c=5 in the given Venn diagram. Find a and b.<br /><img src='https://www.fatskills.com/class11maths/mathematics-questions-answers-venn-diagrams-q4.png' alt='mathematics-questions-answers-venn-diagrams-q4' width='159' height='118' />