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Let U be the set of all triangles in a p...

Let U be the set of all triangles in a plane. If A is the set of all triangles with at least one angle different from `60^@`, what is A'?

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The set of right-angled triangles in a plane is :

In a triangle at most one angle is :

Can you have a triangle with all the angles equal to 60^@ ?

Can you have a triangle with all the three angles less than 60^@ ?

Can you have a triangle with all the three angles greater than 60^@ ?

PSEB-SETS-EXERCISE
  1. Draw appropriate Venn diagram for the following : (A nn B)'

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  2. Draw appropriate Venn diagram for the following : A' uu B'

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  3. Let U be the set of all triangles in a plane. If A is the set of all t...

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  4. Fill in the blanks to make the following a true statement : A uu A'=.....

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  5. Fill in the blanks to make the following a true statement : phi' nn A=...

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  6. Fill in the blanks to make the following a true statement : A nn A'=.....

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  7. Fill in the blanks to make the following a true statement : U' nn A = ...

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  8. If X and Y are two sets such that n ( X ) = 17, n ( Y ) = 23 and n(X u...

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  9. If X and Y are two sets such that X uu Y has 18 elements, X has 8 elem...

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  10. In a group of 400 people, 250 can speak Hindi and 200 can speak Englis...

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  11. If S and T are two sets such that S has 21 elements, T has 32 elements...

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  12. If X and Y are two sets such that X has 40 elements, X uu Y has 60 ele...

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  13. In a group of 70 people, 37 like coffee, 52 like tea and each person l...

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  14. In a group of 65 people, 40 like cricket, 10 like both cricket and ten...

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  15. In a committee, 50 people speak French, 20 speak Spanish and 10 speak ...

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  16. Decide, among the following sets, which sets are subsets of one and an...

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  17. In the following, determine whether the statement is true or false. If...

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  18. In the following, determine whether the statement is true or false. If...

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  19. In the following, determine whether the statement is true or false. If...

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  20. In the following, determine whether the statement is true or false. If...

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