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Which of the following collections are s...

Which of the following collections are sets ?
(i) Collection of all natural numbers laying between 21 and 210.
(ii) Collection of all rational numbers which lie between `1/3 and 1/2.`
(iii) Collection of handsome boys in class XI of a given school.
(iv) Collection of all rectangles in a given plane.
(v) Collecting of natural numbers which are divisors of 90.

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RESONANCE-DPP-QUESTION
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  2. If a statement is true for all the values of the variable, such statem...

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  3. Which of the following collections are sets ? (i) Collection of all ...

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  4. Write the following sets in the tabular from : (i) A={x:x is a posit...

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  5. Write the following sets in the set builder from : {:((i), 0={0),(i...

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  6. How many positive integey x ae there such that 3x has 3 digits and 4x ...

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  7. If a and b are positive integers such that a^(2)-b^(4)=2009, find a+b

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  8. Find the number of positive integers x for which f(X)=x^(3)-8x^(2)+20x...

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  9. If a is defined by f (x)=a(0)x^(n)+a(1)x^(n-2)+a(2)x^(n-2)+...+a(n-1)x...

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  10. If a is defined by f (x)=a(0)x^(n)+a(1)x^(n-2)+a(2)x^(n-2)+...+a(n-1)x...

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  11. If a is defined by f (x)=a(0)x^(n)+a(1)x^(n-2)+a(2)x^(n-2)+...+a(n-1)x...

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  12. If a is defined by f (x)=a(0)x^(n)+a(1)x^(n-2)+a(2)x^(n-2)+...+a(n-1)x...

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  13. Which of the following conditions imply that the real number x is rati...

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  14. Let N=(2+1)(2^(2)+1)(2^(4)+1)......(2^(32)+1)+1and n2^(lamda)"then the...

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  15. If (x+y)^(2)=2(x^(2)+y^(2))and(x-y+lamda)^(2)=4,lamdagt0, then lamda i...

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  16. Which of the following sets are empty sets ? (i) {x:x^(2)=2 and x is...

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  17. State which of the following sets are finite and which infinite : (i...

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  18. In each of the following cases, state whether A = B or A ne B. (i) A...

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  19. When two ratios are equal, then the four quantities compositing them a...

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  20. When two ratios are equal, then the four quantities compositing them a...

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