Which of the following set is finite?(a) {1,2,3,4,……………………….}(b) {4,7,9}(c) {1,4,9,16,…………………….}(d) {1,8,27,……………………….}This question was posed to me in class test.The doubt is from Finite and Infinite Sets topic in chapter Sets of Mathematics – Class 11

Which of the following set is finite?(a) {1,2,3,4,………………�

1.	Which of the following set is finite?(a) {1,2,3,4,……………………….}(b) {4,7,9}(c) {1,4,9,16,…………………….}(d) {1,8,27,……………………….}This question was posed to me in class test.The doubt is from Finite and Infinite Sets topic in chapter Sets of Mathematics – Class 11
Answer» Correct option is (B) {4,7,9} To elaborate: {4,7,9} is finite set because it contains finite (countable) number of elements. Rest all are infinite SETS. {1,2,3,4,…………..} is a set of NATURAL numbers. {1,4,9,……………} is a set of SQUARE of natural numbers. {1,8,27,………………………} is a set of cube of natural numbers.

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