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9. Which of the following is null seta) {x; x is an even prime number} b) {x; x2 = 4,xeZ } c) {x; x² - 2 = 0 and x is a natural number} d) {x; x is a vowel which proceed u} |
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Answer» Answer: (i) A set of odd natural NUMBERS divisible by 2 is a null set because no odd number is divisible by 2. (ii) A={2}. A set of even prime numbers is not a null set because 2 is an even prime number. (iii) {X:x is a natural number,x<5 andx>7} is a null set because a number cannot be simultaneously LESS than 5 and greater than 7. (iv) {y:y is a point common to any TWO parallel LINES} is a null set because parallel lines do not intersect. Hence, they have no common point. |
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