# IGCSE Mathematics Paper-1: Specimen Questions with Answers 27 - 29 of 175

## Question number: 27

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Essay Question▾

### Describe in Detail

(a) A balloon man has 30 balloons. In which 8 balloons are pink, 12 balloons are white and 10 balloons are blue. One balloon is selected randomly. So, find the probability of not getting pink balloon.

### Explanation

Here, There are total 30 balloons. 8 are pink, 12 are white and 10 are blue.

So, probability of pink balloons is:

Probability of white balloons is:

Probability of blue balloons is:

Now, probability of not getting pink balloon = probability of getting white and blue balloons:

OR

Probability of not getting pink balloon =

## Question number: 28

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### Write in Short

Mention order of rotational symmetry.

### Explanation

Here, The order of rotational symmetry is that an object has the number of times that it fits on to itself during a full rotation of 360 degrees.

• So, here given image will rotate and can fit in itself at means two times.
• So, order of symmetry of given image is 2.

## Question number: 29

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### Write in Short

(a) Expand the bracket and simplify the expression

(b) Factorize .

### Explanation

Here,

(a) Expression is

(b) Factorization is the decomposition of an object into a product of other objects or factors which will give the original object after multiplication.

So,

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