Cardinality

JEE Mains 2015 Coaching › Algebra questions › Cardinality

Let S={1,2,3,..........n}.If x denotes the set of all subsets of S containing exactly two elements having 1 as least element,then what is the cardinality of X?

#Mathematics #Algebra

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7 Answers

rocky89 ·2012-05-09 20:50:17

Anyone?????????????????????

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Vivek @ Born this Way ·2012-05-09 22:31:58

You just need to do some basic counting.

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rocky89 ·2012-05-11 21:10:59

What is the ans???????

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Arnab Kundu ·2012-05-14 22:40:11

If 1 is the least element and there are only two elements,..... isnt the number (n-1) only comes to any persons mind immediately?

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rocky89 ·2012-05-15 01:32:41

How bro m nt able to get that....

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Arnab Kundu ·2012-05-15 23:28:07

I am requesting you the check your question and your answer....

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rocky89 ·2012-05-16 05:24:31

Bro question is correct!!!!!

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Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

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Cardinality

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