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State whether each of the following set is finite or infinite: The set of lines which are parallel to the x-axis ; The set of letters in the English alphabet ;The set of numbers which are multiple of 5

Q.3 State whether each of the following set is finite or infinite:

 (i) The set of lines which are parallel to the x-axis

(ii) The set of letters in the English alphabet

(iii) The set of numbers which are multiple of 5 

(iv) The set of animals living on the earth

(v) The set of circles passing through the origin (0,0)

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(i) Lines parallel to the x-axis are infinite.

Hence, it is an infinite set.

(ii) Letters in English alphabets are 26 letters which are finite.

Hence, it is a finite set.

(iii) Numbers which are multiple of 5 has no limit, they are infinite.

Hence, it is an infinite set.

(iv) Animals living on earth are finite though the number is very high.

Hence, it is a finite set.

(v) There is an infinite number of circles which pass through the origin.

Hence, it is an infinite set.

 

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