## Saturday, 19 March 2011

## Sunday, 13 March 2011

## Friday, 11 March 2011

### 11 March Chemistry Quiz: IITJEE, AIEEE, CET and XII Board

Please click on the link to access today's questions in chemistry:

Chemistry Quiz Click here

Chemistry Quiz Click here

## Tuesday, 1 March 2011

## Monday, 28 February 2011

## Sunday, 27 February 2011

## Saturday, 26 February 2011

### Math Quiz

Try to solve the following. Go to page www.aasanka.com/quiz if you want to know the solution. Pl note Question id for reference.

**Question id: 5081**## Friday, 25 February 2011

### Definitions of set, sub-set, proper sub-set

**SETS**: A collection of well defined objects is called a set. It is always represented by a capital letter. A set can be represented by

(i)

**a venn diagram**(ii)

**an equation or an expression**or (iii)

**verbal expression**.

- A set can be represented by a closed figure like a circle, a triangle etc. Such a representation is called a
**Venn diagram**.

The points inside this figure represent the members of the set. - If a set A contains objects having property P in common, we write the

set A ≡ {x / x has property P}

If B ≡{3, 4} ≡ {x / x ∈ W and x^{2}- 7x + 12 = 0}.

If C ≡ {7, 8, 9, 10, ...} ≡ {x / x ∈ W, x ≥ 7.

This is also known as the**set builder notation**. - If a set A is set of all vowels in English alphabets, then A ≡ {a, e, i, o, u}.

A ≡ {set of all vowels in English alphabets}

This is**verbally**expressed

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