Question

EXERCISE 10(A)
1.
State whether or not the following elements form a set; if not, give reason:
(0) All the easy problems in your text book.
(ii) All the three sided figures.
(iii) The first five counting numbers.
(iv) All the tall boys of your class.
(v) The last three days of a week.
(vi) All triangles that are difficult to draw.
(vii) The first three letters of the English alphabet.
(viii) All tasty fruits.
(ix) All the clever boys of class 6.
(x) All the good schools in Delhi.
(xi) All the girls in your class whose heights are less than your height.
(xii) All the boys in your class whose heights are more than your height.
(xiii) All the problems in your Mathematics book that are difficult for Amit.​

Answer 1

Answer:

i. No.

ii. Yes.

iii. Yes.

iv. No.

v. Yes.

vi. No.

vii. Yes.

viii. No.

ix. No.

x. No.

xi. Yes.

xii. Yes.

Explanation:

The Nos are not specified. Eg: A triangle easy to draw for you, may be difficult to draw for someone else. The Yeses are countable and specified. Eg: The last three days of your week are the same as the last three days of someone else's week also.

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