Q1 of 162 Page 2

Describe the following sets in Roster form:

{x N: x2< 25}.

First thing analyze the given data. x ϵ N that implies x is a natural number.


x2 < 25


⇒ x < ±5


As x belongs to the natural number that means x < 5.


All numbers less than 5 are 1,2,3,4.


∴ Roster form will be {1,2,3,4}.


More from this chapter

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3

If A={0,1,2,3,4,5,6,7,8,9,10}, then insert the appropriate symbol or in each of the following blank spaces:

i. 4 ……A ii. -4……A


iii. 12…..A iv. 9…..A


v. 0……A vi. -2……A

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Describe the following sets in Roster form:

{x:x is a letter before e in the English alphabet}.

 1

Describe the following sets in Roster form:

{x N: x is a prime number, 10 < x < 20}

 1

Describe the following sets in Roster form:

{x N: x = 2n, n N}.