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CLASS_11_MATHS_SOLUTIONS_NCERT

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Class XI Chapter 1 – Sets Maths<br />

______________________________________________________________________________<br />

Question 6:<br />

Let U be the set of all triangles in a plane. If A is the set of all triangles with at least one angle<br />

different from 60 , what is<br />

Solution 6:<br />

A'<br />

A' ?<br />

is the set of all equilateral triangles.<br />

Question 7:<br />

Fill in the blanks to make each of the following a true statement:<br />

(i)<br />

(ii)<br />

(iii)<br />

(iv)<br />

AA' ...<br />

' A<br />

AA' ...<br />

U' A...<br />

Solution 7:<br />

AA'<br />

U<br />

(i)<br />

(ii) ' A U A A<br />

' A<br />

A<br />

(iii) A<br />

(iv)<br />

U'<br />

A'<br />

<br />

U ' A A <br />

A <br />

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